Angular Kinematics: $(2$ pts$)$ A discus thrower executes a throw in $0\mathrm{.}9$ s $.$ His throwing arm is $0\mathrm{.}70$ m long. If the tangential velocity of the discus is $24\frac{m}{s}$ at the moment of release, what are the magnitudes of the tangential and radial accelerations of the discus just before it is released?

$($a$)$ Tangential acceleration:

$($b$)$ Radial acceleration: