Two identical ball, A and B , are each attached to very light string, and each s

Question

Two identical ball, A and B , are each attached to very light string, and each string is wrapped around the rim of a friction-less pulley of mass M, the only difference is that the  pulley for ball A is a solid disk, while the one for ball B is a hollow disk, like part(e) in table 9.2. If both balls are released from rest and fall the same distance, which one will have more kinetic energy, or will they have the same kinetic energy? Explain your reasoning.

Explanation / Answer

They both will have same kinetic energy

Since Kinetic energy gained = Potential energy lost

Since in both cases potential energy lost is same so kinetic energy gained is same

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