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Question: A cyclist moving on a circular track of radius 40 m completes half a revolution in 40 s. Its average...

A cyclist moving on a circular track of radius 40 m completes half a revolution in 40 s. Its average velocity is

A

Zero

B

4π m s−14 \pi \mathrm {~m} \mathrm {~s} ^ { - 1 }

C

2 m s-1

D

8π m s−18 \pi \mathrm {~m} \mathrm {~s} ^ { - 1 }

Answer

2 m s-1

Explanation

Solution

Average velocity

= Displacement  Time taken =2Rt=2×4040=2 ms−1= \frac { \text { Displacement } } { \text { Time taken } } = \frac { 2 \mathrm { R } } { \mathrm { t } } = \frac { 2 \times 40 } { 40 } = 2 \mathrm {~ms} ^ { - 1 }