A car’s speed increases from at to at

PHYSICS · Single correct · CBSE · Physics · Motion · Motion

Problem

A car’s speed increases from 10 m s−110\,\text{m\,s}^{-1} at t=2 st = 2\,\text{s} to 25 m s−125\,\text{m\,s}^{-1} at t=7 st = 7\,\text{s}. Calculate its average acceleration during this interval. (a) 5 m s−25\,\text{m\,s}^{-2} (b) 3 m s−23\,\text{m\,s}^{-2} (c) 2.1 m s−22.1\,\text{m\,s}^{-2} (d) 7.5 m s−27.5\,\text{m\,s}^{-2}

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