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 (−70 m/s) and a second piece, also of mass m, moves with velocity (−70 m/s). The third piece has mass 3m. (a) Just after the explosion, what is the magnitude of the velocity of the third piece?  --------m/s (b) What is the direction of the velocity of the third piece?  -----------° counterclockwise from the +x-axis

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