Question

give an expression for the speed of an athlete if he takes time 't' to go around a circular track of radius 'r'

Answer 1

Answer:

An expression for speed of an athlete ,

S = T /2πr

Explanation:

(1)If a body is moving in a circular orbit of radius r

(2) the body covers a distance equal to the circumference of that circle , d=2πr

(3)This amount of distance is covered in time T.

So, the speed of a body (S) in uniform circular motion is

S = T /2πr

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