Relative angle between two balls with equal mass after collision

AI Thread Summary
The discussion centers on the relative angle between two equal-mass balls after a collision, specifically when one ball is stationary beforehand. It is established that the angle is always 90 degrees due to the conservation of momentum and kinetic energy in elastic collisions. This outcome is not random but a consistent result in physics. A reference link to a previous discussion on the topic is provided for further reading. The thread is now closed, and any additional questions should be directed to a new thread in the physics homework subforum.
Phunee
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I´m working on a physics hand-in and found the relative angle between the two balls after collison(where one is stationary before the collison) to be exactly 90degrees, is this random or is it always so?
It´s worth mentioning that total momentum and kinetic energy is conserved.

The hand in is attached and the problem I´m referring to is problem 3
 

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A.T. has provided a link to the previous discussion of this problem. We can close the thread, and if there are any more questions start a new thread in the physics homework sub forum.
 

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