Question

A body moving along a circular track of radius 100m completes one revolution in 4minutes. What is his average speed and average velocity in one full revolution

Answer 1

$$\begin{gathered} \mathrm{Answer} \\ \mathrm{distance}\mathrm{travelled}\mathrm{in}\mathrm{one}\mathrm{revolution}=2\mathrm{\pi }\times 100\mathrm{m} \\ \mathrm{displacement}\mathrm{in}\mathrm{one}\mathrm{revolution}=0 \\ \mathrm{time}\mathrm{taken}=4\mathrm{minute}=4\times 60\mathrm{s} \\ \mathrm{average}\mathrm{speed}=\frac{\mathrm{distance}}{\mathrm{time}} \\ =\frac{2\mathrm{\pi }\times 100}{4\times 60}=2.616\mathrm{m}/\sec \\ \mathrm{Average}\mathrm{velocity}=\mathrm{displacement}=0 \end{gathered}$$