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A car is running at a speed of $54 km / h$ . The speed of the car in $m / s$ will be?

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14 m s^{- 1}

15 m s^{- 1}

16 m s^{- 1}

17 m s^{- 1}

answer is B.

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Detailed Solution

A car is running at a speed of

54 km / h

. The speed of the car in

m s^{- 1}

15 m s^{- 1} .

Speed is defined as the distance travelled per unit of time. It is a scalar quantity. Given,
Speed of the car,

s = 54 km / h

. We will convert the speed of the can to

\frac{m}{s} .

We can write

= > 54 \frac{km}{hr} \times \frac{1000 m}{60 \times 60 s}

= > 54 \times \frac{1000 m}{3600 s}

= > 54 \times \frac{5}{18} = 15 m s^{- 1}

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