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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 is the average speed and average velocity on each complete lap? (π=3.14)

A
Velocity 10 m/s, speed 10 m/s
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B
Velocity zero, speed 10 m/s
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C
Velocity zero, speed zero
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D
Velocity 10 m/s, speed zero
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Solution

The correct option is B Velocity zero, speed 10 m/s
Radius of lap = 100m
Circumference =2πR=200π=628m
time taken to cover one lap = 62.8s
Hence average speed =62862.8=10ms1
Average velocity = 0 as the inital and final positions are same (after completing a lap) (displacement = 0)
Hence option B is correct.

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