Question

11. Usain Bolt completes 200 m(one round) race in a circular track in 20 s. Find his:
a. Speed b. velocity

Answer 1

Answer:

Explanation:

According to this question, the direction is not mentioned so velocity = speed

S = D/T

= 200/20

=10m/s

Answer 2

Answer:

speed= distance/time = 200/20 = 10m/s

velocity = displacement/time = diameter/time

200m = 2 pi r

r = 200*7/22*2

= 700/22 = 32m (approx)

D = 2r = 64m

velocity = 64/20 = 3.2 m/s

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