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A car moving at $60 {ms}^{- 1}$ is caused to stop in 3 s .Its average deceleration in ${ms}^{- 2}$ is

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answer is A.

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Detailed Solution

u = 60 m/s v = 0 t = 3s

$a = \frac{v - u}{t} = \frac{0 - 60}{3} = - 20$

$a = - 20 {m/s}^{2}$

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