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A 2.2-kg fire rocket travels east 50 meters in 4.2 seconds and then it explodes and breaks apart into 3 pieces. The first piece

A 2.2-kg fire rocket travels east 50 meters in 4.2 seconds and then it explodes and breaks apart into 3 pieces. The first piece is 1.2-kg and travels west at 7 m/s. The second piece is 0.7-kg and travels east at 22 m/s. A) What is the mass of the third piece? B) What is the velocity of the third piece?

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