an athlete completes one round of a circular track of diameter 200m in

1.	an athlete completes one round of a circular track of diameter 200m in40sec.what will be the displacement at the end of 2minutes 20sec
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 ] Distance covered in 1 round = Circumference of the circle Circumference of the circle = 2πr Diameter = 200 mRadius = 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 secDistance covered in 140 sec = 15.71 × 140 = 2199.4 m

an athlete completes one round of a circular track of diameter 200m in40sec.what will be the displacement at the end of 2minutes 20sec

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 ]

Distance covered in 1 round = Circumference of the circle

Circumference of the circle = 2πr

Diameter = 200 mRadius = 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 secDistance covered in 140 sec = 15.71 × 140 = 2199.4 m

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