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Question

A block of mass 2 kg is kept inside a lift. Lift starts moving downward with an acceleration of a = 12m/s2. Height of the lift is 4m. Time after which block will strike roof of the lift is (Take g = 10m/s2)


A

2 second

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B

3.5 second

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C

4 second

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D

5.2 second

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Solution

The correct option is A

2 second


Block will loose the contact with the lift and starts moving in upward direction w.r.t. the lift.

Apply 1D motion equation for the relative motion, srel=urelt+12arel t24=0+12(10(12))t24=12(2)t2t=2s


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