Question

an athlete completes one round of a circular track of diameter 49 metre in 20 seconds calculate the distance covered and displacement at the end of 30 seconds

Answer 1

Howdy !!

your answer is ---

Given , diameter of circular path = 49m
so, radius r = 49/2 m

now , distance covered by athlete
= 2πr = 2 × 22/7 × 49/2
= 154 m
so, athlete covered 154 m in 20 sec

now, at 30 second
the athlete covered πr of circle

so, displacement = diameter of circular pat

therefore , displacement = 49m

hence, distance = 154 m &

displacement = 49 m



hope it help you
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Answer 2

Circumference of track = 22/7 x 49 = 154 
So he runs 154 m in 20 sec
Therefore 1 sec = 154/20 = 7.7 m
Therefore  30 sec = 7.7 x 30 = 231 m
So Distance covered = 231 meters
Therefore displacement = 231 - 154 = 77 meters 

hope it help youu.....

:-D