Q. 13

A person standing on the floor of an elevator drops a coin. The coin reaches the floor of the elevator in a time t1 if the elevator is stationary and in time t2 if it is moving uniformly. Then
A. t1 = t2

B. t1 < t2

C. t1 > t2

D. t1 < t2 or t1 > t2 depending on whether the lift is going up or down.

Answer :

In both the case the coin will drop in the same amount of time because even though the elevator is moving with uniform velocity from man’s perspective inside the elevator, everything is at rest and only force is the gravitational force. Thus, the velocity will not add a pseudo force and the time taken to reach the ground will be the same. Thus, option A is correct.

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