1. The problem statement, all variables and given/known data particle 1 with mass 6.7 kg going 7.3 m/s collides inelastically with a particle of mass 4 kg at rest. find the final velocity of particle one after the collision. 2. Relevant equations Ki = Kf but, mechanical energy is not conserved in an inelastic collision. pi = pf (initial momentum = final momentum): mvi = mvf 3. The attempt at a solution I decided to use the conservation of momentum because it is always conserved (at least for the problems I am dealing with). m1vi1 + m2vi2 = (m1 + m2)vf vi2 = 0 i have both particles at the same final velocity because they buckle together after the collision, therefore they share the same velocity. vf = m1vi1/(m1 + m2) = (6.7*7.3)/(6.7 + 4) = 4.57 m/s Is this correct?