Question

An athlete takes t seconds to go round 5 times around a circular path of radius r, speed of the athlete is .
a)2pier/t
b)10pier/t
c)zero
d) r/t

Answer 1

Answer:

Speed = Distance / time

Here, Distance = 2πr ( circumference of circle with radius ‘ r’.

Time = t

So putting the values

Speed = 2πr / t

Answer 2

Ans a)2pier/t

Explanation:

An athlete takes t seconds to go round 5 times around a circular path of radius r, speed of the athlete is.2pier/t