A wheel rotating at 12 rev/s is brought to rest in 6 s. The average angular deceleration in rad/`s^(2)` of the wheel during this process is

Options

A. `4 pi`
B. 4
C. 72
D. `1//pi`

Answer

A

Explanation

`w_(1)^(0)=12xx12pi(rad)/(s)`
`=24 pi(rad)/(s)`
`w_(f)=0`
`trianglet=6s`
`=-4pi(rad)/(sec^(2))`