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Practice question

MCQ

Question

A stone is thrown upwards at 15m/s from a tower. It hits the ground 4s later. What is the height of the tower? (Take g\=10m/s2)

Options

Choose one · Correct answer highlighted

Explanation

Use y=v0t+12at2. Downward is positive, so v0=−15m/s, a=10m/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 25 m as the result, so option B is correct.

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