An athlete throws a discus from rest to a final angular velocity of 15 rad/s in 0.270 s before releasing it. During acceleration, discus moves a circular arc of radius 0.810 m. Acceleration of discus before it is released is......`ms^(-2).`

Options

A. A)45
B. B)182
C. C)187
D. D)192

Answer

A

Explanation

`omega = omega _(0) + alpha t `
`implies omega = 0 + alpha t `
`implies alpha = (15)/( 0 .270) rad // s ^(2)`
Now, `a = r , alpha = 0.81 xx (15)/(. 270 ) = 45 ms ^(-2)`