Question

a boy start running from his house with a uniform speed and take 1 hour to reach the paly ground. if the distance between his house and the play ground is 3.6 km . calculate his speed in (1) km/h (2) m/s (3) cm/s



class 9 CBSE​

Answer 1

Answer:

Explanation:

TIME- 1hr.

DIST.= 3.6 km.

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Therefore, in km/hr= 3.6 km/hr

because, as it is told to convert into km/hr and here 3.6 km is already given. So, by the condition to it will be 3.6 km/hr.

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Now,

m/s = 3.6 × 1000/ 3600 m/s

then, the ans by calculating is = 1.0 m/s.

so, it will be only 1m/s.

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So as to convert it to cm/s,

then, cm/s= 3.6 × 1000/3600

= 36 × 1000 × 10/ 3600

= 100 cm/s.