Class 9 · Science · Exploration

4. Describing Motion Around Us

Try question 1

A runner covers 100 m in 20 s. The average speed is

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Answer and explanation

Answer: B. 5 m/s

Speed = distance ÷ time = 100 ÷ 20 = 5 m/s.

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Try question 2

The SI unit of velocity is

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Answer and explanation

Answer: B. m/s

Velocity is displacement per unit time: metre per second.

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Try question 3

A body covering equal distances in equal intervals of time is in

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Answer and explanation

Answer: A. uniform motion

Equal distances in equal times means constant speed.

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