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A body is thrown up in a lift with a velocity u relative to the lift and the time of flight is found to be
\( \mathrm{P} \) ' \( t \) '. The acceleration with which the lift is moving up is :

W
(1) \( \frac{\mathrm{u}-\mathrm{gt}}{\mathrm{t}} \)
(2) \( \frac{2 \mathrm{u}-\mathrm{gt}}{\mathrm{t}} \)
(3) \( \frac{u+g t}{t} \)
(4) \( \frac{2 \mathrm{u}+\mathrm{gt}}{\mathrm{t}} \)
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