Two metal balls are hung from strings the first ball 009 kg, Ask an Expert

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Two metal balls are hung from strings. The first ball, 0.09 kg, is pulled to the side and released so that it strikes the second ball with a speed of 1.62 m/s. The two balls stick together and the combined mass has a speed of 0.31 m/s after collision. What is the mass of the second ball?

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