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
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Solution
(d) g downward
Gravity is the only force acting on the stone when it is released. And, we know that gravity is always in the downward direction.