Question

A frictionless pulley has the shape of a uniform solid cylinder of mass 2.5 kg and radius 15 cm. A 2.1 kg stone is attached to a very light wire that is wrapped around the rim of the pulley, and the system is released from rest. When the stone has lost 3J of gravitational potential energy, how much kinetic energy does the pulley have?

The Answer is 1.1 J I just don't know how to reach this answer.

Answer #1

Problem 2. (based on Young & Freedman 9.47) A frictionless
pulley has the shape of a uniform solid disk of mass 2.50 kg and
radius .0200 m. A stone of unknown mass is attached to a very light
wire that is wrapped around the rim of the pulley. When the system
is released from rest, the stone accelerates downward at 5.9 m/s 2
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A 12.0-kg box resting on a horizontal, frictionless surface is
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