A stone is released from an elevator going up with an acceleration a and speed u. The acceleration and speed of the stone just after the release is

a upwards, zero

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(g - a) upwards, u downwards

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(g - a) downwards, zero

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g downwards, u upwards

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Solution

The correct option is D g downwards, u upwards
Initially, the elevator and stone are moving upwards with a speed $u$ . When the stone is released from elevator, the stone continues to move upwards due to inertia and thus speed of the stone just after it is released is $u$ (upwards). Acceleration due to gravity $g$ acts in the downward direction.

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