Amass attached to a 50.0 cm long string starts from rest and is rotated 40 times in one minute before reaching a final angular speed. determine the angular acceleration of the mass, assuming that it is constant.

To solve this problem it is only necessary to apply the kinematic equations of angular motion description, for this purpose we know by definition that,

Where,

Angular Displacement

Angular Acceleration

Angular velocity

Initial angular displacement

For this case we have neither angular velocity nor initial angular displacement, then

Re-arrange for

Replacing our values,

Therefore the ANgular acceleration of the mass is

answer: good job it's all correct !

explanation: