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Mass 1 is 3kg, mass 2 is 5kg, and they are connected by a light pulley and string. mass 2 is elevated 4meters, and mass 1 is at rest at height 0. When mass 2 is "let go", what is the speed of mass 1 when mass 2 hits height 0, and how high will mass 1 reach before returning to rest?

Can someone clue me in as to how to solve this problem? I am trying to help my husband, the student, and don't know how to go about doing so. Any beginnings would help, and if there's a formula out there, I would love to know about it.

Thanks so much.