Question
A person moves on a semicircular track of radius 42 m during a morning walk. He starts at one end of the track and reaches the other end. Find the
i) distance covered and
ii) the displacement of the person.
Solution
Given,
Radius of the semicircular track, r = 42 m
i) Distance covered is equal to the circumference of the semicircular track = pi * r
= 3.14 *42
= 131.8 m
= 132 m
ii) Displacement of the person = diameter of the semicircle = (42+ 42) = 84 m
