Abstract
An analysis of elastic waves is used to predict the final velocity of a flat metal plate that is struck by a second plate made of the same material. The loss of kinetic energy of the system is also calculated. Three examples corresponding to different mass ratios are considered, and it is seen that solutions for the ratio of the final velocity of the second plate to the initial velocity of the first plate, and for the ratio of the final kinetic energy to the initial kinetic energy, always lie between the solutions that correspond to perfectly elastic and perfectly inelastic collisions. One interesting result is that rebound never occurs, even if the mass of the projectile plate is less than that of the target.
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