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Two masses are connected by a massless string, passing over a massless, frictionless pulley as shown...

Two masses are connected by a massless string, passing over a massless, frictionless pulley as shown in the diagram. Mass m1 = 5 kg, and is released from rest at a height h = 4 m above the table. Mass m2 = 3 kg, and starts at rest on the table. Ignore friction and air resistance. Take the system to be the two masses and the earth. What is the potential energy of this system, in Joules? Next, you let go of the masses. What is the speed of the two masses when m1 hits the table, in meters per second?

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