Rotational kinematics of a ball

[medicle]

Homework Statement

A ball attached to a string starts at rest and undergoes a constant angular acceleration as it
travels in a horizontal circle of radius 0.30 m. After 0.65 sec, the angular speed of the ball is 9.7
rad/s. Determine the magnitudes of the ball’s tangential, centripetal, and total acceleration at
t = 0.30 s.

Homework Equations

The Attempt at a Solution

at=w-wo/t = 9.7/.65 =15 15(.30)=4.5m/s^2

which is correct. for ac I did 9.7/.3= 32.3 32.3(.65)= 21 21(.3)= 6.3


Is this correct?

NOt sure were to start for a?

Any help would be awesome.

 

[medicle]

never mind