Question

An elevator is moving with 2.5 ms^-1. A bolt in the elevator ceiling 3 m above the elevator falls. How long does it take for the bolt to fall on the floor of elevator?

• A. 0.731 s
• B. 0.762 s
• C. 0.782 s
• D. 8.31 s

Answer 1

Answer: (C)

0.782 s

Answer 2

1/2 gt² = 3 u_initial = v_rel =0 because bolt will also get a velocity 2.5 ms^-1.

t = $\sqrt { .6 }$ = 0.782 s