Question

A boy running along a circular track of diameter of 100m. he completes 5 rounds in 5 mins.Calculate the linear speed of a boy​

Answer 1

Tatal distance is equal to circumference=2πr

hence total distance covered in first round is 2*22/7*20

by using speed=distance/ time

u can find speed

and then you have to find distance for three minutes

and hence displacement is zero

Answer 2

Answer:

Explanation:

linear speed = linear distance / time taken

imagine cutting the circular track at a point . now make the track straight we can see that 2π r is the distance

radius = diameter /2 = 50 m

time = 5 mins = 300 seconds

the boy runs 5 times to and fro therefore distance 5X orginal distance =

( 2 * 3.14 * 50  ) x 5

speed = 1570 / 300 = 5.2 m/s