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Question

A stone falls freely from rest and reaches a velocity of 14.7m/s. How long did it fall? (Take g\=9.8m/s2)

Options

Choose one · Correct answer highlighted

Explanation

Use v=v0+gt. Here, v0=0, v=14.7m/s, g=9.8m/s2. As per NCERT Chapter 3, equations v=u+at, s=ut+½at², v²=u²+2as describe uniformly accelerated motion. Applying correct signs and units gives 2 s as the result, so option B is correct.