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An athelete completes one round of a cir...

An athelete completes one round of a circular track radius R in 40 s.What will be his displacement at the end of 2 minutes 20 sec?

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(i) Distance coverted in 40 s
`=2xxpixx100`
`(r=(d)/(2)=(200m)/(2)=100m)`
Distance covered in 1 s
`=(200pi)/(40)`
Distance covered in 2 min 20 s or 140 s
`=(200pi)/(40)xx140`
`=5pixx140`
`=700pi`
`=700xx3.14`
`=2198` m
(ii) Displacement in 2 min 20 s = 0 m (`because` initial and final position is the same).
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