A body of mass 2 kg is tied to the end od a string 2 m long and revolved in horizontal circle .If the breaking tension of the string is 400 N, then the maximum velocity of the body will be

Options

A. 30 `"rad s"^(-1)`
B. `20 "rad s"^(-1)`
C. `10 "rad s"^(-1)`
D. `25 "rad s"^(-1)`

Answer

A

Explanation

`T = momega^(2)r rArr omega^(2) = T/(mr) = 900/(2 xx 0.5) = 900`
`rArr omega = 30 "rad"//s^(-1)`