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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 s. What will be his displacement at the end of 2 min 20 s?

A

7R

B

2R

C

`2piR`

D

`7piR`

Text Solution

Verified by Experts

The correct Answer is:
B
1 round = 40 s
Given time = 2 min 20 s = `2 xx 60 + 20 = 140 s`
1 — 40
7—140
Number of rounds =`140/40= 3 +1/2 ` round
Displacement in 3 round = 0
Displacement in `1/2` round = PQ = 2R.
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