Question

An athelete throws discuss from rest to a final angular velocity of $15$ rad/s in $0.27$s before releasing it. During acceleration,discuss moves in a circular arc of radius $0.810$m.Acceleration of discuss before it is released is .

Answer 1

We know linear velocity $v=\omega r$

here $\omega$ = angular velocity = $15rad/s$ and $r$= radius= $0.810m$

Thus $v=15\times 0.810=12.15m/s$

Also we know acceleration $a=\frac{v-u}{t}$ where v=final velocity and u= initial velocity and t=time.

$a=\frac{12.15}{0.27}=45m/s^2$