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Homework Statement:
 A billiard ball of mass 0.155kg moves with a velocity of 12.5m/s toward a stationary billiard ball of identical mass and strikes it in a headon collision. The first billiard ball comes to a complete stop. Determine whether the collision was elastic.
Relevant Equations:

Pt=Pt`
m1v1+m2v2=m1v1`+m2v2`
I tried solving it using this method and I got 12.5m/s, and assumed the collision was elastic.
The answer is actually 6.32m/s [41.5 degrees counterclockwise from the original direction of the first ball]; the collision is not elastic: Ek = 12.1J Ek`= 10.2J
I have absolutely no idea how the textbook could even get this answer. If you could explain the steps and why that would be greatly appreciated. Thanks!
The answer is actually 6.32m/s [41.5 degrees counterclockwise from the original direction of the first ball]; the collision is not elastic: Ek = 12.1J Ek`= 10.2J
I have absolutely no idea how the textbook could even get this answer. If you could explain the steps and why that would be greatly appreciated. Thanks!