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Practice question

MCQ

Question

A rocket accelerates from rest at 5m/s2 for 8s, then moves at constant speed for 4s. What is the total distance covered?

Options

Choose one · Correct answer highlighted

Explanation

Phase 1: v=5⋅8=40m/s, x1=12⋅5⋅(8)2=160m. 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 320 m as the result, so option D is correct.

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