*Originally posted by Crowley*

**Hi guys, I need to do a calculation, but I can't find anything on the web to help me out.
**

Check this: http://www.redhotpawn.com/board/showthread.php?threadid=30250

Sounds like you need a few equations:

1. Conservation of momentum:

m1*v1 + m2*v2 = m1*u1 + m2*u2

Where: m1, m2 are the masses of the objects; v1, v2 are the velocities before the collision; and u1, u2 are the velocities after the collision; and

2. Momentum/energy relation for an elastic collision:

0.5*m*(v^2) = dp/dt

Where: m is the mass of the object, v is the velocity, and dp/dt is the change in momentum over time.

What is the question exactly?