Q.

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

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a

0

b

2R

c

πR

d

2πr

answer is A.

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Detailed Solution

t = 2min 40 sec= 160 secDisplacement is shortest distance between initial and final points of the motion of the bodyIn 160 sec he will complete 8 rotations hence the displacement is zero.
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