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Practice question

MCQ

Question

A stone is thrown upwards from a 60m cliff at 20m/s. What is the time taken to reach a point 20m below the cliff’s edge? (Take g\=10m/s2)

Options

Choose one · Correct answer highlighted

Explanation

Displacement y=−80m (downward positive). 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(1+√2) s (≈4.83 s) as the result, so option C is correct.

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