A cyclist moves on a circular track form (A) to (D) in time (t) as shown in Fig. 2 (a). 41. What is the average speed an average velcity of the cyclist.

Explanation

Distanc travelled in time ` t= ABCD = (3 pi r)/2`
Average speed `= (distance travelled )/(time take)=(3 pi r //2)/t`
`= (3 pi r)/(2t)`
Displacement in time ` t=AD = sqrt(r^(2) + r^(2)) = r aqrt 2`
Average velocity `= (r aqrt 2)/t`.