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Question

A car accelerates from rest at 2.5m/s2 until it reaches 25m/s, then immediately decelerates at 5m/s2 to rest. What is the total time taken?

Options

Choose one · Correct answer highlighted

Explanation

Acceleration: t1=252.5=10s. 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 12 s as the result, so option A is correct.