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Question: A body is thrown up in a lift with a velocity u relative to the lift and the time of flight is found...

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 't'. The acceleration with which the lift is moving up will be-

A

u−gtt\frac{u - gt}{t}

B

u+gtt\frac{u + gt}{t}

C

2u−gtt\frac{2u - gt}{t}

D

2u+gtt\frac{2u + gt}{t}

Answer

2u−gtt\frac{2u - gt}{t}

Explanation

Solution

geff = g + a = g + 2ut\frac{2u}{t}