A car runs at constant speed on a circular track of radius 100 m, taking 62.8 s on each lap. What are the average speed and average velocity for one complete lap?
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Question

A car runs at constant speed on a circular track of radius 100 m, taking 62.8 s on each lap. What are the average speed and average velocity for one complete lap?

G1 Physics · Accepted Answer

One complete lap has distance 2πR=200π m≈628 m, so average speed =628/62.8=10 m s⁻¹. Net displacement after one lap is zero, so average velocity is zero. Hence option B.