An athlete throws a discus from rest to a final angular velocity of `15 rad s^-1` in `0.270 s` before releasing it. During acceleration, discuss moves a circular arc of radius `0.810 m`. Acceleration of discus before it is released is.

Options

A. `45 ms^-2`
B. `180 ms^-2`
C. `187 ms^-2`
D. `192 ms^-2`

Answer

A

Explanation

(a) `omega = omega_0 + prop_t` or `omega = 0 + prop t`
or `prop = (omega)/(t) = (15)/(0.270) rads^-2`
:. `a = r prop = 0.81 xx (15)/(0.270) = 45 ms^-2`.