m1v1+m2v2 =m1u1+m2u2....i think so...thats what i was trying to find out!!!!
Newton's second law is that the force equals the rate of change of momentum:
F = d/dt (MV) = MdV/dt + VdM/dt.
Usually the second term gets forgotten, leaving F=MdV/dt, or in other words:
force = mass times acceleration.