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An athelete completes one round of a cir...

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

A

zero

B

2R

C

`2piR`

D

`7piR`

Text Solution

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The correct Answer is:
B
t=2min 20 sec=120+20=140 sec.
after each complete rotation, displacement becomes zero.
Number of rotation `=(140)/(40)=3+(1)/(2)`
`therefore` displacement in `(1)/(2)` rotation=2R
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