Question: A solid ball of mass 1.4 kg and diameter 15 cm is rotating about its diameter at 70 rev/min. (a) What is its kinetic energy?

A solid ball of mass 1.4 kg and diameter 15 cm is rotating about its diameter at 70 rev/min. 

(a) What is its kinetic energy? 

(b) If an additional 2 J of energy are supplied to the rotational energy, what is the new angular speed of the ball?

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