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A 5 kg mass is sitting at rest when it suddenly explodes into three fragments. The first fragment has mass 1 kg and is seen

A 5 kg mass is sitting at rest when it suddenly explodes into three fragments. The first fragment has mass 1 kg and is seen leaving the explosion moving at 8 m/s to the right. The second fragment has mass 2 kg and is seen leaving the explosion moving at 6 m/s to the left. What is the velocity of the third fragment?

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