The mean speed of a moving body is given by, vrms=‌
‌ total distance ‌
‌ total time taken ‌
The velocity vector for a moving body is given by, vvv=‌
‌ total displacement ‌
‌ total time taken ‌
Consider the above diagram for the representation of the movement of ball around the circular arc. The mean speed of the ball is calculated as, vrms=‌
2Ï€R
4
×‌
1
T
=v1 The velocity vector for the ball is calculated as vvv=‌
√2R
T
=v2 The ratio of the two speeds is calculated as, ‌