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Practice question

MCQ

Question

A stone is thrown horizontally at 9m/s from a height of 78.4m. What is its horizontal range? (Take g\=9.8m/s2)

Options

Choose one · Correct answer highlighted

Explanation

Time to fall: h=12gt2⇒78.4=12×9.8×t2⇒78.4=4.9t2⇒t2=16⇒t=4s. 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 36 m as the result, so option D is correct.

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