1. The problem statement, all variables and given/known data During testing of a fireworks device an engineer records that data shown in the table below when the device, initially at rest, explodes under controlled conditions into three components that spread out horizontally. Determine the unknown quantity. http://img687.imageshack.us/img687/8969/screenshot20091105atnov.th.png [Broken] 2. Relevant equations No idea how to attempt this at all. I am thinking that you use the momentum equation: m1v1 +m2v2 = m1v1' +m2v2' And potentially the kinetic energy equation (if it's elastic): 0.5m1v1^2 +0.5m2v2^2 = 0.5m1v1'^2 +0.5m2v2'^2 3. The attempt at a solution I have no idea where to start. If you could help that would be great. Thanks.