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Question

A truck moving at 144km/h decelerates uniformly and stops in 12s. What is the magnitude of deceleration?

Options

Choose one · Correct answer highlighted

Explanation

Convert speed: 144km/h=144⋅10003600=40m/s. 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 40 m/s as the result, so option A is correct.