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# Tag Archives: kinematics problem

## Relative position of a helicopter

If a helicopter takes off from a point on earth.(at certain altitude) and its still at that point in air.After certain time interval the observer whose position was same as that of helicopter’s take off point will see the helicopter right above him.
The question arises is that how it is possible if earth is rotating hence the observer is also, but the helicopter is in air.How is it possible?
Thanks…

## More Problems from Kinematics

1. “On a 120 km track, a train moves the first 30 km at a uniform speed of 30 km/h. How fast must the train in the next 90 km so as to have average speed 60 km/h for the entire trip?”
2. “A person goes form one place to another on bike
with uniform speed 40 km/h and returns back at
uniform speed of 60 km/h. Find average speed
during the journey.”

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