A car travels 36 km in 2 hours- Its average speed is-A- 18 m - sB- 36 m - sC- 5 m - sD- None of these

The correct option is C 5 m/sAverage speed = Distance travelled / Time taken = 36/2 km/h = 18 km/h The speed is in km/h. In order to convert it to m/s, we n ...

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Standard VII

Physics

Average Speed

A car travels...

Question

A car travels 36 km in 2 hours. Its average speed is:

18 m/s

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36 m/s

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5 m/s

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None of these

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Solution

The correct option is C 5 m/s
Average speed = Distance travelled / Time taken
$= \frac{36}{2} k m / h$
$= 18 k m / h$

The speed is in km/h. In order to convert it to m/s, we need to convert the units of distance and time

$18 k m / h = \frac{18 k m}{1 h}$

$= \frac{18 \times 1000 m}{1 \times 60 \times 60 s}$

$= \frac{18 \times 1000}{3600} m / s$

$= 5 m / s$

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A car travels 36 km in 2 hours. Its average speed is:

The correct option is C 5 m/sAverage speed = Distance travelled / Time taken =362 km/h =18 km/h The speed is in km/h. In order to convert it to m/s, we need to convert the units of distance and time 18 km/h=18 km1 h =18×1000 m1×60×60 s =18×10003600 m/s =5m/s