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I tried dividing the xdirection equation with ydirection equation and then getting 1 = tan (theta1) + tan(theta2)...but it didn't work... I need help... or a little guidance.

Homework Statement a) Initially, mass one (2.40 kg) has a velocity of 5.70 m/s and mass two (2.20 kg) is at rest. After they collide, mass one emerges at an angle theta = 31.0 degrees. What is the speed of mass one after the collision if the collision is completely elastic? (Note, there are...