Question

Theree 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. (NCT) . 17. What is the magnitude of the displacemnt vector for each ? which girl is thsi equal to the actual length of path skated ?
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Answer 1

Deplacement for each gilr ` = vec (PQ)`
:. Magnitude of the displacement for each girl
`= PQ = diameter of circular ice ground = 2 xx 200 = 400 m`.
For girl (B), the magnitude of displacemnet is equal to the actual length of path skated.