Question

An athlete runs along the boundary of a circular field of radius 21 m. Find his displacement after he completes 3/4 th of the round.

Answer 1

Answer:

please mark a brilliant

Explanation:

The displacement us the shortest distance between initial and final position so after covering the half distance of circular track he will cover a semi circle thus the displacement will be the diameter of the circular track.i.e 40m.

Answer 2

Distance in circular motion = 2πr = 2 × 3.14 × 21 = 131.88 m

3/4th of the round = 131.88 × 3/4 = 98.91 m

Displacement = 4/3 × 21 = 28 m

∴ Distance = 98.91 m

∴ Displacement = 28 m