Home » Ask Physics » The question of minimum time and minimum distance in crossing a river.

The question of minimum time and minimum distance in crossing a river.

Share with:


A man crosses a river in a boat if he crosses the river in minimum time he take 10min with a drift 120metre if he crosses the river taking shortest path he takes 12.5min find the width of the river

Comments

  1. ans is 200 m.
    as for shortest time the drift is
    x =V(w)*t………V(w) is the velocity of water
    120 m = V(w)*10 s
    V(w)=12 m/s

    also x=[ V(w)*d ]/V(m)…..V(m) is velocity of man.
    therefore by solving d=10V(m)

    now for shortest path
    d={V(m) – V(w)}^1/2 * T
    substuting the values we will get d=200m

Ask a Doubt

Post your Physics Doubts here

Name (required)

Email (required)

Subject

Message/Doubt/Question

Upload a file if required

Archives

askphysics@Twitter

  • Post Edited: Scattering, Blue Sky, reddish sun https://t.co/wrRZys2xpe
    about 3 weeks ago
%d bloggers like this: