(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A 5.0-gram particle moving 60 m/s collides with a 2.0-gram particle initially at rest. After the collision each of the particles has a velocity that is directed 30° from the original direction of motion of the 5.0-gram particle. What is the speed of the 2.0-gram particle after the collision?

2. Relevant equations

conservation of kinetic energy equation

conservation of linear momentum equation and the x and y components

m1v1i=m1v1fcos(theta) + m2v2fcos(phi)

3. The attempt at a solution

m1=5

m2=2

m2=.4m1

theta=30

phi=30

Since the the only two variables I am missing are the two final velocities, I have tried solving one of the equations for mass2s final velocity and then subsituting that value into either the original equation or another one. Everytime i end with an answer that is not one of my choice. I am confused as to how i should go about find the final velocities.

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# Homework Help: Two Dimensional Collisions

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