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Dear Student,
5) A perfectly elastic collision is defined as one in which there is no loss of kinetic energy in the collision. An inelastic collision is one in which part of the kinetic energy is changed to some other form of energy in the collision.

in inellastic collision there is a special case when a body gets imbedded in the other,in this circumstancepart of the Energy of the system is lost in collision while rest is calculated as follow,from conservation of momentummv=(m+M)V    or V=mvm+MThe ration of K.EK.E.fK.E.i=12m+Mmm+Mv212mv2=mm+MFraction of energy lost.K.E.i-K.E.fK.E.i=1-mm+MK.E.iK.E.i=Mm+M

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