Two hockey pucks, one with mass m and the other with mass 3m, slide on a flat, frictionless plane of ice. Originally, the lighter puck is Sliding eastward at a speed of 2 m/s, while the other is sliding northward at a speed of 2 m/s. The pucks collide and stick together. What is their joint velocity (magnitude and direction) after the collision?
how to solve this physics problem?
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