What is the magnitude of the velocity of the third piece

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A vessel at rest at the origin of an xy coordinate system explodes into three pieces. Just after the explosion, one piece, of mass m, moves with velocity (-85 m/s) and a second piece, also of mass m, moves with velocity (-85 m/s). The third piece has mass 3m.
Just after the explosion, what is the magnitude of the velocity of the third piece.

Reference no: EM13498689

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