Question

A cyclist moving on a circular track of radius 40 m completes half a revolution in 40 sec average velocity is …..

(a) 0

(b) 2 m/s 

(c) 4 m/s 

(d) 2π m/s

Answer 1

(b) v = 2 m/s

Displacement of the cyclist in half revolution is 

d = diameter of the circular track 

i.e., d= 80 m 

Time taken, t = 40 s

Average  velocity, V = \(\frac{Total\,displacement}{Total \, time}\) = \(\frac{80}{40}\)

v = 2 m/s