b) An object completes one round of a circular track of radius 140 m in 20 sec. Calculate its velocity.
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Explanation:
If athlete completes one round of a circular track of radius R in 40 seconds then after
2 m 20 sec =140 sec
he would have completed 3.5 rounds
that means he will be at the diametrically opposite point of starting point.
Displacement =diameter=2R
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