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Two friends, al and jo, have a combined mass of 137 kg. at an ice skating rink they stand close together on skates, at rest and facing each other, with a compressed spring between them. the spring is kept from pushing them apart, because they are holding each other. when they release their arms, al moves off in one direction at a speed of 1.18 m/s, while jo moves off in the opposite direction at a speed of 1.37 m/s. assuming that friction is negligible, find al's mass.
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Two friends, al and jo, have a combined mass of 137 kg. at an ice skating rink they stand close toge...
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