Question

A runner completes one round of a circular path of radius r in 40 seconds with uniform speed his displacement and distance travelled after 2 minutes will be

Answer 1

Given:

t = 40sec

d = 2πr

To Find

Displacement and distance travelled in 2 min = 120 sec

Solution

v = d/t

v = 2πr/40

v = πr/20 m/s

Distance

d = vt

d = πr/20 × 120

d = πr × 6

d = 6πr

Since, initial and final positions are same, displacement = 0