Home » Posts tagged 'projectile motion'

# Tag Archives: projectile motion

## Projectile Motion – Numerical Problems (Assignment for KV Pattom Class XI students)

The students are requested to start solving these numerical problems. More questions will be added till 8 pm on 13/09/2014. There will be more than 20 questions in all. All students are expected to solve at least 20 numericals among these. The deadline form submission is 15/09/2014.

1. A football player kick a ball at an angle of 37° to the horizontal with an initial speed of 15 m/s. Assuming that the ball travels in a vertical plane, calculate (i) the time at which the ball reaches the highest point. (ii) the maximum height reached by the ball (iii) the horizontal range of the projectile and (iv) the time for which the ball is in air.
2. A body is projected with a velocity of 20 m/s in a direction making an angle 60° with the horizontal. CCalculate (i) position after 0.5 seconds and  (ii) velocity after 0.5 seconds
3. The maximum vertical height of a projectile is 10 m. If the magnitude of the initial velocity is 28 m/s, what is the direction of the initial velocity? (g=9.8 m/s)
4. A bullet fired from a gun with a velocity of 140 m/s strikes the ground at the same level as the gun at a distance of 1 km. Find the angle of inclination with the horizontal at which the bullet is fired. (g=9.8 m/s)
5. A bullet is fired at an angle of 15° with the horizontal and hits the ground 6 km away. Is it possible to hit a target 10 km away by adjusting the angle of projection assuming the initial speed to be the same?
6. A cricketer can throw a ball to a maximum horizontal distance of 160 m. Calculate the maximum vertical height to which he can throw the ball. (g=10  m/s)
7. A football is kicked with 20 m/s at a projection angle of 45°. A receiver on the goal line 25 metres away in the direction of the kick runs the same instant to meet the ball. What must be his speed, if he is to catch the ball before it hits the ground?
8. A bullet fired at an angle of 60° with the vertical hits the ground at a distance of 2 km. Calculate the distance at which the bullet will hit the ground when fired at an angle of 45°, assuming the speed to be the same.
9. A person observes a bird on tree 39.6 m high and at a distance of 59.2m. With what velocity the person should shoot an arrow at an angle of 45° so that it may hit the bird?
10. A ball is thrown from the top of a tower with an initial velocity of 10 m/s at an angle of 30° with the horizontal. If it hits the ground at a distance of 17.3 m from the base of the tower, calculate the height of the tower. (Given g =10  m/s)
11. Prove that the time of flight T and the horizontal range R of a projectile are connected by the equation gT2 =2R tanθ, where θ is the angle of projection.
12. Show that the range of a projectile for two angles α and β is same if α+β=90°
13. A body is projected with velocity of 40 m/s. After 2 s it crosses a vertical pole of height 20.4 m. Calculate the angle of projection and horizontal range.
14. A plane is flying horizontally at a height of 1000 m with a velocity of 100 m/s when a bomb is released from it. Find (i) the time taken by it to reach the ground. (ii) the velocity with which the bomb hits the target and (iii) the distance of the target.
15. From the top of a building 19.6 m high a ball is projected horizontally. After how long does it strike the ground? If the line joining the point of projection to the point where it hits the ground makes an angle of 45° with the horizontal, what is the initial velocity of the ball.
16. A body is thrown horizontally from the top of a tower and strikes the ground after 2 seconds at an angle of 45° with the horizontal. Find the height of the tower and the speed with which the body was thrown. Take g =9.8 m/s)
17. A ball is projected horizontally from a tower with a velocity of 4 m/s. Find the velocity of the ball after 0.7 s. (Given g =10  m/s)
18. In between two hills of heights 100 m and 92 m respectively , there is a valley of breadth 16m. If a vehicle jumps from the first hill to the second, what must be the minimum horizontal velocity so that it may not fall into the valley? (Given g =10  m/s)
19. A mailbag is to be dropped into a post office from an aeroplane flying horizontally with a velocity of 270 km/h at a height of 176.4 m above the ground. How far must the aeroplane be from the post office at the time of dropping the bag so that the bag directly falls into the post office?
20. An aeroplane is flying in a horizontal direction with a velocity of 600 km/h and at a height of 1960 m. When it is above a point A on ground an object is dropped from it. The object strike the ground at the point B. Find the distance AB.
21. Two tall buildings are situated 200 m apart. With what speed must a ball be thrown horizontally from the window 540 m above the ground in one building so that it will enter a window 50 m above the ground in the other?

## We are not Psychic – It’s Physics Here!

We receive many questions daily where in questions based on dreams, love, relations etc. are asked.

We thought initially that those were posted by spammers. But the emails and posts were not from spam-bots but genuine IPs and persons. On analysis, it was found that those posts were made by people who thought that the site name as “AskPsychics” and thus they asked such questions. Some even misspell Psychic as Physic.

When they don’t get their answers, they come back to the site and start looking at the answered questions to find that the site is all about Physics and that there are no Psychichs here!

Thanks to our principle that we do not allow questions to be published directly. All questions posted via the Ask a Question link reach the email inbox of the admin and editors of the site. we scrutinize the question and are posted to the site only if it is related to Physics or education.

Once again I would like to announce –

# Not Psychics

## Physics Honours as career

I want to pursue my career in Physics Honours . Can you please suggest me some good institutions ?

## CBSE Class 10 Exam Date Sheet Announced

DATE-SHEET SECONDARY SCHOOL EXAMINATION,2013
DAY,DATE AND TIME SUBJECT NAME AND SUB-CODE

Friday,01st March, 2013 10:30 AM
PAINTING 049

Saturday,02nd March, 2013 10:30 AM
MATHEMATICS 041

Monday,04th March, 2013 10:30 AM
HINDI COURSE-A 002
HINDI COURSE-B 085

Tuesday,05th March, 2013 10:30 AM
MUSIC CAR.VOCAL 031
MUSIC CAR.INS.MEL. 032
MUSIC CAR.INS.PER. 033
MUSIC HIND.VOCAL 034
MUSIC HIND.INS.MEL 035
MUSIC HIND.INS.PER 036
ELEM. OF BUSINESS 154
ELEM BOOK-K & ACCY 254
E-TYPEWRITING-ENG 354
E-TYPEWRITING-HIN 454

Wednesday,06th March, 2013 10:30 AM
URDU COURSE-A 003
BENGALI 005
TELUGU 007
GUJARATI 010
MANIPURI 011
ASSAMESE 014
ARABIC 016
TIBETAN 017
FRENCH 018
GERMAN 020
PERSIAN 023
NEPALI 024
LIMBOO 025
LEPCHA 026
BODO 092
TANGKHUL 093
JAPANESE 094
BHUTIA 095
MIZO 098
BAHASA MELAYU 099
COMM. SANSKRIT 122
URDU COURSE-B 303Friday,08th March, 2013 10:30 AM
ENGLISH COMM. 101
ENGLISH LNG & LIT. 184

Saturday,09th March, 2013 10:30 AM
FOUNDATION OF I T 165

Monday,11th March, 2013 10:30 AM
PUNJABI 004
TAMIL 006
MARATHI 009
MALAYALAM 012
ODIA 013
SPANISH 096
KASHMIRI 097

Tuesday,12th March, 2013 10:30 AM
SOCIAL SCIENCE 087

Thursday,14th March, 2013 10:30 AM
SCIENCE-THEORY 086
SCIENCE W/O PRAC. 090

Friday,15th March, 2013 10:30 AM
HOME SCIENCE 064

Important – Regarding Class X School Based Assessment
Schools are being advised to conduct School Based Assessment
(Scheme 1) between 16th March to 31st March 2013.

## CBSE Exam 2013 Date Sheet Class 12

DATE-SHEET SENIOR SCHOOL EXAMINATION,2013

Friday,01st March, 2013 10:30 AM
ENGLISH ELECTIVE 001
FUNCTIONAL ENGLISH 101
ENGLISH CORE 301
Monday,04th March, 2013 10:30 AM
HISTORY 027
Tuesday,05th March, 2013 10:30 AM
PHYSICS 042
ELECTRIC MACHINES 623
FABRICATN.TECH-II 630
AC & REFRGTN-III 632
M PROD TPT &M COOP 640
OPTICS 658
CLINICAL BIO-CHEM. 661
COMM. HEALTH NURII 664
ACCOMODAT.SERVICES 691
TRAVEL TRADE MGMT 694
CONFECTIONERY 698
CLSFN.&CATALOGUING 703
POULTRY PDTS& TECH 717
C HEALTH NURSING 731
Wednesday,06th March, 2013 10:30 AM
Friday,08th March, 2013 10:30 AM
POLITICAL SCIENCE 028
Monday,11th March, 2013 10:30 AM
CHEMISTRY 043
HERITAGE CRAFTS 070
OFF. COMMUNICATION 606
CONS BEHV & PROTCN 615
MGMT OF BANK OFFCE 621
APPLIED PHYSICS 625
FABRICATN.TECH-III 631
TV & VIDEO SYSTEMS 636
ELECTRICAL ENGG. 637
MILK & MILK PRODS. 639
BIOLOGY-OPTHALMIC 657
LAB. MEDICINE 660
FUND OF NURSING II 663
FOOD PREPARATIONII 690
INDIA-TOURIST DEST 693
FOOD SCI.& HYGIENE 696
PRIN &PRA-LIFE INS 705
POULTRY NUTR & PHY 716
INT TO FINANCL MKT 723
CRTV & COMM M M II 739
Wednesday,13th March, 2013 10:30 AM
GEOGRAPHY 029
LENDING OPERATIONS 620
AUTOSHOP REP& PRAC 628
I T SYSTEMS 699
Friday,15th March, 2013 10:30 AM
BIOLOGY 044
ACCOUNTANCY 055
SINDHI 108
PORTUGUESE 119
RUSSIAN 121
SPANISH 196
KASHMIRI 197
ELE.COST A/C & AUD 612
SALESMANSHIP 614
STORE ACCOUNTING 618
MECH. ENGINEERING 626
AUTO ENGINEERING 627
AC & REFRGTN-IV 633
YOGA ANATOMY &PHYS 656
MEAL PLNG & SERVIC 676
CLOTHING CONST 686
BASIC DESIGN 687
TOUR MGMT & MP PLN 695
REFERENCE SERVICE 704
Saturday,16th March, 2013 10:30 AM
HOME SCIENCE 064
Monday,18th March, 2013 10:30 AM
HINDI ELECTIVE 002
TAMIL 106
GUJARATI 110
MANIPURI 111
MALAYALAM 112
ODIA 113
ASSAMESE 114
TIBETAN 117
GERMAN 120
PERSIAN 123
NEPALI 124
LIMBOO 125
LEPCHA 126
BODO 192
TANGKHUL 193
JAPANESE 194
BHUTIA 195
BAHASA MELAYU 199
HINDI CORE 302
Wednesday,20th March, 2013 10:30 AM
MATHEMATICS 041
SECT PRAC & ACCNTG 605
CIVIL ENGINEERING 629
FLORICULTURE 643
COSMETIC CHEMISTRY 655
OPHTHALMIC TECH. 659
MICROBIOLOGY 662
MAT.&CHILD H.NURII 665
ESTB & MGMT OF FSU 677
TEXTILE SCIENCE 684
BAKERY SCIENCE 697
TPT. SYSTEMS &MGMT 712
POULTRY DISE & CNT 718
FIRST AID &MEDCL C 730
HEALTH CENTRE MGMT 733
FOOD PRODUCTIONIII 734
Friday,22nd March, 2013 10:30 AM
INFORMATICS PRAC. 065
COMPUTER SCIENCE 083
Saturday,23rd March, 2013 10:30 AM
FASHION STUDIES 053
SHORTHAND ENGLISH 608
SHORTHAND HINDI 610
ENGINEERING SCI. 622
ELN.DEV.& CIRCUITS 634
DAIRY PLANT INSTRU 641
VEGETABLE CULTURE 642
B THERAPY &H DR-II 654
ADVANCE FOOD PREP 675
DESG & PAT MAKING 685
DYEING & PRINTING 688
FOOD& BEV SERV. II 692
H EDN & PUB HEALTH 728
FOOD& BEV C & CNTL 737
Monday,25th March, 2013 10:30 AM
PHYSICAL EDUCATION 048
Saturday,30th March, 2013 10:30 AM
ECONOMICS 030
BIOTECHNOLOGY 045
ELECT APPLIANCES 624
Monday,01st April, 2013 10:30 AM
PAINTING 049
GRAPHICS 050
SCULPTURE 051
APP/COMMERCIAL ART 052
AGRICULTURE 068
CR WRTNG TR STUDY 069
Wednesday,03rd April, 2013 10:30 AM
SANSKRIT ELECTIVE 022
ENGG. GRAPHICS 046
BENGALI 105
TELUGU 107
MARATHI 109
ARABIC 116
FRENCH 118
MIZO 198
SANSKRIT CORE 322
MARKETING 613
BUSINESS DATA PROC 700
EVOL& FORMS M M II 738
Thursday,04th April, 2013 10:30 AM
URDU ELECTIVE 003
DANCE-KATHAK 056
DANCE-BHARATNATYAM 057
DANCE-KUCHIPUDI 058
DANCE-ODISSI 059
DANCE-MANIPURI 060
DANCE-KATHAKALI 061
DANCE-MOHINIYATTAM 062
URDU CORE 303
Friday,05th April, 2013 10:30 AM
MUSIC CAR.VOCAL 031
MUSIC CAR.INS.MEL. 032
MUSIC CAR.INS.PER. 033
MUSIC HIND.VOCAL 034
MUSIC HIND.INS.MEL 035
MUSIC HIND.INS.PER 036
OFFCE PROC.& PRAC. 604
Saturday,06th April, 2013 10:30 AM
SOCIOLOGY 039
GRAPHIC DESIGNS 071
DTP CAD & MULTIMED 701
B P O SKILLS 724
Tuesday,09th April, 2013 10:30 AM
PSYCHOLOGY 037
FINANCIAL ACCNTG 611
Friday,12th April, 2013 10:30 AM
PHILOSOPHY 040
ENTREPRENEURSHIP 066
CASH MGMT & H-KEEP 619
POST HARV TECH&PRD 644
LIB. ADMN & MGMT. 702
COMPUTER& LIFE I A 706
B CONCEPT-H &MED T 729
MIDWIFERY 732
FOOD PRODUCTION IV 735
FOOD SERVICES II 736
GEOSPATIAL TECH II 740
Tuesday,16th April, 2013 10:30AM
MULTIMEDIA & WEB T 067
MASS MEDIA STUDIES 072
TYPOGRAPHY &CA ENG 607
TYPOGRAPHY &CA HIN 609
Wednesday,17th April, 2013 10:30 AM
PUNJABI 104

## Understanding Projectile Motion

IN A PROJECTILE MOTION WE TAKE MOTION IN A HORIZONTAL DIRECTION AS g=0 while in vertical motion as g=-9.8 meter / second square why?

Projectile Motion is an example for motion in two dimension. It can be studied easily by resolving into two components – The vertical motion is affected by gravity and the horizontal motion is not affected by gravity.

Therefore we take g=0 when we consider the horizontal component of motion as the projectile is not accelerated in the horizontal direction. The horizontal component of velocity remains constant through out its motion.

The following presentation will help you understand the concept better.

A PowerPoint Presentation on projectile_motion

### Hits so far @ AskPhysics

• 2,274,296 hits