Question

A cyclist moving along a circular track of radius 60 km completes a revolution in 5 minutes. find his average speed and average velocity.

Answer 1

Given: radius=60 km = 60*1000=60000m                  (1km=1000m)

Time=  5 min= 5*60 =300sec                                       (1 min = 60 secs)

Displacement in 1 revolution= 0       (in circular path dispacement is 0)

Distance travelled in one revolution= circumference of a circle= 2 pi r

Distance travelled in one revolution= 2* (22/7)*60000           (pi=22/7)

Distance travelled in one revolution=2640000/7

Distance travelled in one revolution=377142.85 m

Average speed= distance/time= 377142.85/300 =    1257.14 m/s

Average velocity=Displacement/ time = 0(zero)