Q

A boy on a 20 m tower releases a stone. What is its speed on reaching the ground? Take g = 10 m/s².

RRB Group-D 28/09/2018 / Shift II 2018
✓ Answer: A 20 m/s
Assuming release from rest, v = √(2gh) = √400 = 20 m/s. The source says 'throws' but supplies no launch velocity; its solution assumes u = 0.
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