Question

Consider the motion of the tip of the minute hand of a clock. In one hour
(a) the displacement is zero
(b) the distance covered is zero
(c) the average speed is zero
(d) the average velocity is zero

Answer 1

(a) the displacement is zero
(d) the average velocity is zero

Displacement is zero because the initial and final positions are the same.

Average velocity = $\frac{\mathrm{Displacement}}{\mathrm{Total}\mathrm{time}}=0$

Distance covered = $2\mathrm{\pi }r$ ≠ 0

Average speed =$\frac{\mathrm{Distance}\mathrm{travelled}}{\mathrm{Total}\mathrm{time}\mathrm{taken}}\ne 0$