The velocity of a car is 18 ms -1- Express this velocity in kmh -1-A- 64-8 km - hB- 70 km - hrC- 76 km - hD- 65-7 km - h

The correct option is A 64.8 km/h 1 ms^ 1 = 1/1000km1/3600hr 1 ms^ 1= 3.6 kmh^ 1 ∴ 18 ms^ 1= 18 × 3.6 kmh^ 1 18 ms^ 1 = 64.8 kmh^ 1≈ 65 kmh^ 1 Therefore, ...

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Standard IX

Physics

Velocity

The velocity ...

Question

The velocity of a car is $18 m s^{- 1}$ . Express this velocity in $k m h^{- 1}$ .

70 km/ hr

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64.8 km/h

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76 km/h

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65.7 km/h

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Solution

The correct option is B
64.8 km/h

$1 m s^{- 1} = \frac{\frac{1}{1000} k m}{\frac{1}{3600} h r}$
$1 m s^{- 1} = 3.6 k m h^{- 1}$

$∴ 18 m s^{- 1} = 18 \times 3.6 k m h^{- 1}$
$18 m s^{- 1} = 64.8 k m h^{- 1} \approx 65 k m h^{- 1}$
Therefore, the velocity of the car is $65 k m h^{- 1}$ .

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The velocity of a car is 18 ms−1. Express this velocity in kmh−1.

The correct option is B 64.8 km/h 1 ms−1=11000km13600hr 1 ms−1=3.6 kmh−1 ∴18 ms−1=18×3.6 kmh−1 18 ms−1=64.8 kmh−1≈65 kmh−1 Therefore, the velocity of the car is 65 kmh−1.

The velocity of a car is $18 m s^{- 1}$ . Express this velocity in $k m h^{- 1}$ .

The correct option is B
64.8 km/h

$1 m s^{- 1} = \frac{\frac{1}{1000} k m}{\frac{1}{3600} h r}$
$1 m s^{- 1} = 3.6 k m h^{- 1}$

$∴ 18 m s^{- 1} = 18 \times 3.6 k m h^{- 1}$
$18 m s^{- 1} = 64.8 k m h^{- 1} \approx 65 k m h^{- 1}$
Therefore, the velocity of the car is $65 k m h^{- 1}$ .