What's that form of Newton's law where the momentum of two colliding objects starts out strong in object A, and the energy transfers into object B and makes the momentum in object A weaker?

If that's not one of the Newton's laws, please tell me. I'm not completely positive :P

Question

What's that form of Newton's law where the momentum of two colliding objects starts out strong in object A, and the energy transfers into object B and makes the momentum in object A weaker? 


If that's not one of the Newton's laws, please tell me. I'm not completely positive :P

yrelhan4 · Answer

its conservation of energy. part of energy of A is transferred to B to start moving it, hence taking away some kinetic energy of A.

yrelhan4 · Answer

also conservation of mometum. 
m1v1=M1V1 + M2V2

anonymous · Answer

thank you! Sorry it took so long, my internet went out.