Question

15. A boy runs on the circumference of a circular track of radius 1km. What is the distance
and displacement of the boy when he completes 1 round ?
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Answer 1

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Answer 2

$\mathtt{\huge{ \fbox{Solution :)}}}$

Given ,

A boy runs on the circumference of a circular track of radius 1 km and also a boy completes 1 round on the same circular track

We know that ,

The length of path traveled by a body is called distance

Thus ,

Distance = 2πr

Distance = 2 × (22/7) × 1

Distance = (44/7) × 1

Distance = 6.7 km (approx)

Distance in terms of SI unit is :

Distance = 6.7 × 1000

Distance = 6700 m (approx)

Hence , the distance is 6.7 km or 6700 m (approx)

Now , we have to find displacement when a boy completes 1 round

Thus ,

Displacement = 0 , because displacement is defined as the shortest distance between final position and initial position

Hence , the displacement is 0

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