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  4. An athlete 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 sec ?

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Q. An athlete 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 sec ?

Motion in a Plane

Solution:

Total time of motion on circular track $=2 \times 60$ $+20=140 s$
Time period of revolution $=40 s$.
Therefore displacement in time $(=3 \times 40=120 s )=$ zero as athelete will be reaching at the starting point. Thus displacement in 140 seconds $=$ displacement in 20 seconds $=2 R$