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Question

A stone falls freely from a height of 78.4m. How long does it take to reach the ground? (Take g\=9.8m/s2)

Options

Choose one · Correct answer highlighted

Explanation

For free fall, use y=12gt2. 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 4 s as the result, so option A is correct.