the question is:
A stone is released from an elevator going up with an acceleration a. The acceleration of the stone after the release is
(a) a upward
(b) (g-a) upward
(c) (g-a) downward
(d) g downward.
my teacher told us that ans is (d). according to him As soon as the stone is released from the lift the acceleration 'a' of the lift has no effect on the stone, it is now only under the influence of the gravitational pull. So only acceleration due to gravity 'g' acts.
but according to me acceleration of the lift i.e 'a' should also be acting at the stone at the instant it is released. I got my logic from a question in which a hot air balloon is moving up with a constant velocity 'u' and a stone is released from the ballon on reaching a certain height. it asked what will be the velocity of the stone at the instant it is released from the hot air balloon and the answer was "u" velocity upwards.
although in one it is asking about acceleration and in other about velocity, I find both the question pretty similar. please correct me if wrong. please give me the difference between the two Questions .