Question

a cyclist goes around a circular track once every 2minutes the radius of a circular track is 105m calculate ots speed​

Answer 1

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

Answer:

$\frac{21\pi }{12}$ m/s

Explanation:

See for the speed you need calculate the distance he is travelling i.e the circumference

Circumference = 2$\pi$ × Radius

                         = 2$\pi$ × 105

                         = 210$\pi$

Speed = Distance ÷ Time

           = 210$\pi$ / 2*60

           = $\frac{21\pi }{12}$ m/s