The velocity of a car is 18 m - s- Express this velocity in km - hr-A- 64-8 km - hB- 70 km - hrC- 65-7 km - hD- 76 km - h

The correct option is A 64.8 km/h We know that 1 km=1000 m and 1 hr=60× 60=3600 s ⇒ 1 m/s = 1/1000 km/1/3600 hr ∴ 1 m/s= 3.6 km/hr ∴ 18 m/s= 18 × 3.6 k ...

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Standard IX

Physics

Average Velocity

The velocity ...

Question

The velocity of a car is $18 m / s$ . Express this velocity in $k m / h r$ .

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

We know that $1 k m = 1000 m$ and $1 h r = 60 \times 60 = 3600 s$

$\Rightarrow 1 m / s = \frac{\frac{1}{1000} k m}{\frac{1}{3600} h r}$

$∴ 1 m / s = 3.6 k m / h r$

$∴ 18 m / s = 18 \times 3.6 k m / h r$

$= 64.8 k m / h r$

Thus, the velocity of the car is $64.8 k m / h r$ .

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The velocity of a car is 18m/s. Express this velocity in km/hr.

The correct option is B 64.8 km/h We know that 1 km=1000 m and 1 hr=60×60=3600 s ⇒1 m/s=11000 km13600 hr ∴1 m/s=3.6 km/hr ∴18 m/s=18×3.6 km/hr =64.8 km/hr Thus, the velocity of the car is 64.8 km/hr.

The velocity of a car is $18 m / s$ . Express this velocity in $k m / h r$ .