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This Java applet deals with the extreme cases of a collision process illustrated by two wagons: For an elastic collision it is
characteristic that the sum of the kinetic energies of the involved bodies is constant. After a perfectly inelastic collision, however,
both bodies have the same velocity; the sum of their kinetic energies is reduced, compared with the initial value, because a part of it
has changed into internal energy (warming up). Foreign language versions available.
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