I'm new to this forum, and during the 10+ hours of googling I've done I've found links to this site over and over. Since I can't figure it out on my own, perhaps this awesome community can help. My problem is as follows: I have Object A and Object B, and I want to know their force upon collision. Object A weights 2.7 grams and is traveling at 54 Meters per second. (194.4 kph) It's force equals to: 0.1458 newton 14.867462385218195 gram force 0.014867462385218196 Kg Force ----- Object B weights 200 grams and is traveling at 44 m/s It's force equals to: 8.8 newton 897.3502674205769 Gram force 0.8973502674205769 Kg Force How do I calculate this ? Do I just add their gram forces and that's it? Doesn't seem right to me... This is where I get confused. I want to find out how much force is generated when this two objects collide in exact opposite directions. ----><---- If I calculate their kinetic energy.. I don't really know how to convert it back to force ? I'm soo confused. :) Object A Kinetic energy = 3.9366 Joules Object B Kinetic energy = 193.6 Joules Something needs to be multiplied... Any explanation as to how to calculate would be amazing! thanks!