Question

An object moving in a circular path of radius 200m. It completes one revolution in 20 seconds. Find distance and displacement in 2 min 20 sec

Answer 1

Answer:

☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺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 ]

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☺Distance covered in 1 round = Circumference of the circle

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Circumference of the circle = 2πr

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Diameter = 200 m

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Radius = 100 m

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

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

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2min 20 sec = 140 sec

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Distance covered in 140 sec = 15.71 × 140 = 2199.4 m

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