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A boy travels with an average speed of 10 m s-1 for 20 min. How much distance does he travel?

Motion in One Dimension

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Answer

Average speed = 10 m s-1;
time = 20 min
1 min = 60 sec
20 min = 60 x 20 = 1200 sec
distance = ?

Average speed=distancetime10=distance1200distance=1200×10=12000m\text{Average speed} = \dfrac{\text{distance}}{\text{time}} \\[1em] \text{10} = \dfrac{\text{distance}}{\text{1200}} \\[1em] \text{distance} = 1200 \times 10 = 12000 \text{m}

So, distance covered = 12000 m or 12 km.

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