A ball is released from rest from the top of a tower

PHYSICS · Single correct · CBSE · Physics · Gravitation · Gravitation

Problem

A ball is released from rest from the top of a tower. Taking g=9.8 m/s2g = 9.8\,\text{m/s}^2, what is its speed after 4 s4\,\text{s}? (a) 78.4 m/s78.4\,\text{m/s} (b) 40.0 m/s40.0\,\text{m/s} (c) 39.2 m/s39.2\,\text{m/s} (d) 19.6 m/s19.6\,\text{m/s}

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