Question

An athlete is moving around a circular track of a radius of 100 m in 5 minutes. Find his average speed when he completes two and a half revolutions.

a. 5.23 m/s

b. 314 m/s

c. 80 m/s

d. 1.33 m/s

Plz tell me the answer

Answer 1

Answer:

Time taken = 2 min 20sec = 140sec.

Radius r = 100m.

In 40 sec the athlete complete one round.

So, in 140sec the athlete in 140sec = (2 π r) x(3.5) = 2x (22/7) x 100x 3.5=2200m.

At the end of his motion, the athlete will be in the diametrically opposite position.

Displacement = diameter =200m

Explanation:

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