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Practice question

MCQ

Question

A car accelerates from 12m/s at 1.5m/s2 for 4s, then moves at constant speed for 5s. What is the average speed over the entire motion?

Options

Choose one · Correct answer highlighted

Explanation

Phase 1: v=12+1.5⋅4=18m/s, x1=12⋅4+12⋅1.5⋅(4)2=48+12=60m. 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 17 m/s as the result, so option B is correct.

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