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An unstable nucleus of mass 2.1 ? 10?26 kg, initially at rest at the origin of...

An unstable nucleus of mass 2.1 ? 10?26 kg, initially at rest at the origin of a coordinate system, disintegrates into three particles. One particle, having a mass of m1 = 4.6 ? 10?27 kg, moves in the positive y-direction with speed v1 = 6.1 ? 106 m/s. Another particle, of mass m2 = 8.5 ? 10?27 kg, moves in the positive x-direction with speed v2 = 4.5 ? 106 m/s. Find the magnitude and direction of the velocity of the third particle.

magnitude

  

is 6000000 m/s so what is the direction ???  counterclockwise from the +x-axis
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