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An athlete completes on e round …

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An athlete completes on e round of a circular track of diameter 200 m in 40s. What will be the distance covered and the displacement at the end of 2 min 20s.

Posted by Aparna Singh 4 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 4 months ago

Displacement is the shortest distance possible between initial and final position.
As the athlete is in circular motion , displacement is zero. [ THis is because , the initial and final position is the same ]

Distance covered in 1 round = Circumference of the circle

Circumference of the circle = 2πr

Diameter = 200 m
Radius = 100 m

Distance covered in 1 round[ 40 sec ] = 2 × 22/7 × 100 = 628.57 m

Distance covered in 1 sec = 628.57 ÷ 40 = 15.71 m

2min 20 sec = 140 sec
Distance covered in 140 sec = 15.71 × 140 = 2199.4 m

1Thank You

ANSWER

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