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A vessel at rest explodes, breaking into three pieces. Two pieces, having equal mass, fly off...

A vessel at rest explodes, breaking into three pieces. Two pieces, having equal mass, fly off perpendicular to one another with the same speed of 45m/s. One goes along the negative x-axis and the other along the negative y-axis. The third piece has three times the mass of each other piece.
What are the direction and magnitude of its velocity immediately after the explosion?
1)What is the angle with respect to the x-axis?
2)What is the magnitude of its velocity?

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