Question

Question 4.8 Three girls skating on a circular ice ground of radius 200 m start from a point Pon the edge of the ground and reach a point Qdiametrically opposite to Pfollowing different paths as shown in Fig. 4.20. What is the magnitude of the displacement vector for each? For which girl is this equal to the actual length of the path skated?

Chapter Motion In A Plane Page 86

Answer 1

Given : Three girls skating on a circular ice ground of radius 200 m start from a point P on the edge of the ground and reach a point Q diametrically opposite to P following different paths as shown in Fig.

To find : The magnitude of displacement vector for each.

For which girl is this equal to the actual length of the path skated ?

solution : Displacement is the minimum separation between final position to initial position.

Here,

Radius of circular track = 200m

Displacement for each girls = diameter PQ = 2 × radius of circular track = 2 × 200 = 400 m

Here girls B moves along diametre of circular track so, displacement for girl B is equal to the actual length of path skated.

Answer 2

Explanation:

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