An elevator is accelerating upwards with a constant acceleration a `ms^-2`. If a coin is dropped in it by a passenger, then.

Options

A. the coin starts to fall downwards instantaneously as observed by the passenger.
B. the coin starts to fall downwards instantaneously as observed by a ground observer.
C. first, coin continues to move up with same acceleration of a `ms^-2` for some time and then starts falling with gravitational acceleration as observed by a ground observer.
D. None of these

Answer

A

Explanation

After releasing, the coin will come under the effect of gravity only, so it will move with acceleration due to gravity `g` downwards.
When the coin in dropped it has velocity in upwards direction same as that of elevator w.r.t. a person on ground, the coin first will go up and then come down. But w.r.t. a passenger in elevator, it will seem to be falling downwards always because passenger himself has velocity upwards.