Question

a car moves on a circular path of radius 200m with the speed of 72km/h. how much time will it take to complete one revolution

Answer please

Answer 1

Explanation:

speed in metre per second = 72×5/18=20m/s

perimeter of circle=2πr

=1256m

time=distance/speed

t=1256/20=62.8seconds

or=1.2 minutes

Answer 2

Explanation:

Radius = 200m

Speed = 72km/h

v = 2πr/t

72 = 2 × π × 200/t

72 = 400π/t

72 × 7/400 × 22 = t

504/8800 = t

0.057h= t

0.057 × 1000 = t

57s = t

Car takes 57s to complete one revolution