Question

A cyclist goes around a circular track once every 2minutes.if the radius of the circular track is 105meters calculate his speed

Answer 1

Hy dear ------

given :-
Radius , r = 105
time t = 2min
= 120 second
we know also
circumference or distance of circle = 2πr
⇒2×22/7×105
⇒ 660 m
∴ speed = distance / time
⇒660 m/ 120
⇒5·5m/s

Answer 2

speed,v=2πr/time
where,π=22/7
time,t=2min=2×60=120seconds
radius,r=105metres
speed,v=?
then,
v=2×22/7×105/120
=5.5m/s