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I got a problem out of an older physics text (one without a solutions
manual). My students and spent a while debating the method of attaining
the solution. Can someone explain how they would solve it -using energy.
PROBLEM
Masses of 3 kg and 2 kg are hanging at opposite ends of a cord that
passes over a frictionless pulley. The system is held stationary for a
while, then released. What will be the speed of the masses when the 3 kg
mass has descended 0.5 m below its starting point? (USE ENERGY
RELATIONSHIPS TO SOLVE.)