An elevator is moving up with 2.5ms−1. A bolt in the elevator ceiling 3m above the elevator falls. How long (in seconds) does it take for the bolt to fall on the floor of the elevator?
A
0.73
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B
0.71
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C
0.56
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D
1.06
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Solution
The correct option is C0.56 Initial relative velocity of bolt with respect to the elevator u=2.5m/s from the frame of reference of the elevator. ⇒s=ut+12at2 ⇒3=2.5t+1210t2