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

\frac{18}{5} m s^{- 1}

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50 m s^{- 1}

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25 m s^{- 1}

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5 m s^{- 1}

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Solution

The correct option is D $5 m s^{- 1}$
$S p e e d = 18 k m / h = \frac{18 \times 1000 m}{60 \times 60 s} = 5 m / s$

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Similar questions

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:

(i) the speed of car in m $s^{- 1}$ ,
(ii) the retardation of car
(iii) the speed of car after 2 s of applying the brakes.

18 k m h^{- 1}

5 s

5 {m s}^{- 1}

25 {m s}^{- 1}

{m s}^{- 2}

10 m s^{- 1}

25 {ms}^{- 1}

100 m

m s^{- 1}

g = 10 {ms}^{- 2}

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