A car moving at a speed of $20 m s^{- 1}$ is subjected to a uniform retardation of $5 m s^{- 2}$ . It stops after:

100 s

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4 s

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3 s

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5 s

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Solution

The correct option is A $4 s$
$v = u + a t$
$a = - 5 m / s^{2}$
$v = 0$
$u = 20 m / s$
$o = 20 - 5 t$
$\Rightarrow t = 4 s e c$

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A car is moving in a straight line with speed 18 km $h^{- 1}$ . It is stopped in 5 s by applying the brakes. Find:

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(iii) the speed of car after 2 s of applying the brakes.

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