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An open lift is coming down from the top...

An open lift is coming down from the top of building at a constant speed `v=10m//s`. A boy standing on the lift throws a stone vertically upwards at a speed of 30 m/s w.r.t. himself. The time after which he will catch the stone is:

A

4 sec

B

6 sec

C

8 sec

D

10 sec

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The correct Answer is:
B
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ANURAG MISHRA-DESCRIPTION OF MOTION-Level-1
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  16. A particle moves with constant acceleration a in the positive x-axis. ...

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