A grinding wheel turns at 1500 rpm. When the motor is switched off, it makes 50 more turns before…

For rotation with steady angular acceleration: $\omega = \omega_0 + \alpha t$, $\theta = \omega_0t + \tfrac12\alpha t^2$, $\omega^2 = \omega_0^2 + 2\alpha\theta$, with angles in radians ($1\ \text{rev} = 2\pi\ \text{rad}$). A point at radius $r$ has $v = \omega r$, tangential acceleration $\alpha r$ and centripetal acceleration $\omega^2 r$.