A car moving at $2 m s^{- 1}$ is brought to rest by applying brakes. If the brakes offer a retardation of $0.5 m s^{- 2}$ , after what time did the car stop?

1 s

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2 s

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3 s

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4 s

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Solution

The correct option is D $4 s$
Initial velocity, $u = 2 m s^{- 1}$
Final velocity, $v = 0$
Retardation, $a = 0.5 m s^{- 2}$
Let, time $= t$
$v = u - a t$
$t = \frac{u - v}{a} = \frac{2 - 0}{0.5} = 4 s$

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A car moving at 2ms−1 is brought to rest by applying brakes. If the brakes offer a retardation of 0.5ms−2, after what time did the car stop?

The correct option is D 4sInitial velocity, u=2ms−1Final velocity, v=0Retardation, a=0.5ms−2Let, time =tv=u−att=u−va=2−00.5=4 s

A car moving at $2 m s^{- 1}$ is brought to rest by applying brakes. If the brakes offer a retardation of $0.5 m s^{- 2}$ , after what time did the car stop?

The correct option is D $4 s$
Initial velocity, $u = 2 m s^{- 1}$
Final velocity, $v = 0$
Retardation, $a = 0.5 m s^{- 2}$
Let, time $= t$
$v = u - a t$
$t = \frac{u - v}{a} = \frac{2 - 0}{0.5} = 4 s$