A particle is moving along circular path of radius 40 m with a uniform speed of `20m//s`. Then the time taken for the particle to complete half revolution will be

Options

A. `4 pi s `
B. `pi s`
C. `2 pi s`
D. `pi //2 s`

Answer

C

Explanation

`omega = (v)/(r)=(20)/(40)=(1)/(2)`
`T=(2pi)/(omega)=(2pi)/(1/2)=4pi`
`T_(1//2)=(4pi)/(2)=2pi`.