Q

A 2 kg object has kinetic energy of 400 J just before hitting the ground. From what height was it dropped?

RRB Group D 04/12/2018 / Shift-II 2018
✓ Answer: C 20 m
Using g = 10 m/s² and energy conservation, mgh = 400, so h = 400/(2 × 10) = 20 m.
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