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Practice question

MCQ

Question

A particle moves at 20m/s and decelerates at 4m/s2 until its speed is 8m/s, then accelerates at 3m/s2 to 20m/s. What is the total time taken?

Options

Choose one · Correct answer highlighted

Explanation

Phase 1: 8=20−4t⇒t1=3s. 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 6 s as the result, so option A is correct.

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