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05/01/2021 4:43 pm
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An athlete completes one round of a circular track of diameter 200 m in 40 s. What will be the distance covered and the displacement at the end of 2 minutes 20 s?
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05/01/2021 4:48 pm
Diameter, d = 200 m, r = d/2 = 100 m
Time for one round = 40 s
Distance travelled in 2 minutes and 20 s
(2 x 60 + 20 = 140 s) = \(\frac{140}{40}\) = 3.5 rounds
Distance travelled = Circumference of the circle x 3.5
= 2πr x 3.5
= 2 x \(\frac{22}{7}\) = 2200 m
Displacement after 3.5 rounds = diameter of the track = 200 m