Question

Conservation of energy in case of partiallly inelastic collision

Answer 1

A collides with B. A=Mg, B=mg (M>m) and A=v, B=u (v>u).
Linear momentum =
Mgv +mgu=MgV+mgU (A=V,B=U after the collision)
Here despite of crashing, the linear momentum is unchanged. It is the law of Newton