Kinematics Question 782

Question: An athlete completes one round of a circular track of radius 10 m in 40 sec.The distance covered by him in 2 min 20 sec is [Kerala (Med.) 2002]

Options:

A) 70 m

B) 140 m

C) 110 m

D)220 m

Show Answer

Answer:

Correct Answer: D

Solution:

Time period = 40 sec No. of revolution$ =\frac{\text{Total time}}{\text{Time period}} $

$ =\frac{140\sec }{40\sec }=3.5Rev $ . So, distance$ =3.5\times 2\pi R=3.5\times 2\pi \times 10=220m $ .



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