If the speed of a car is 20-ms-1- what is the speed in km-h-1-367210890

The correct option is B 72Given that the speed of a car = 20 ms^ 1=20 m1 s [1 m=1/1000 km, 1 s=1/3600 h] =20 ×1/1000 km1 ×1/60 × 60 h =20 × 36001000 km h^ 1 =7 ...

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Standard VI

Physics

Speed Vs Slow

If the speed ...

Question

If the speed of a car is $20 m s^{- 1}$ , what is the speed in $k m h^{- 1}$ ?

36

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72

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108

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Solution

The correct option is B $72$
Given that the speed of a car $= 20 m s^{- 1}$ $= \frac{20 m}{1 s}$
[ $1 m = \frac{1}{1000} k m, 1 s = \frac{1}{3600} h$ ]
$= \frac{20 \times \frac{1}{1000} k m}{1 \times \frac{1}{60 \times 60} h}$
$= \frac{20 \times 3600}{1000} k m h^{- 1}$
$= 72 k m h^{- 1}$ .

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If the speed of a car is 20 ms−1, what is the speed in km h−1?

The correct option is B 72Given that the speed of a car =20 ms−1=20 m1 s [1 m=11000 km,1 s=13600 h] =20×11000 km1×160×60 h =20×36001000 km h−1 =72 km h−1.

If the speed of a car is $20 m s^{- 1}$ , what is the speed in $k m h^{- 1}$ ?

The correct option is B $72$
Given that the speed of a car $= 20 m s^{- 1}$ $= \frac{20 m}{1 s}$
[ $1 m = \frac{1}{1000} k m, 1 s = \frac{1}{3600} h$ ]
$= \frac{20 \times \frac{1}{1000} k m}{1 \times \frac{1}{60 \times 60} h}$
$= \frac{20 \times 3600}{1000} k m h^{- 1}$
$= 72 k m h^{- 1}$ .