Elastic Collisions - All momentum is conserved, Kinetic energyis conserved, relative speed of approach = relative speed of separation
Example of a perfectly elastic collision - a collision caused by non-contact forces, such as alpha particles being scattered by a nucleus.
Inelastic Collisions - All momentum is conserved, Kinetic energy is not conserved some is lost (usually as sound and heat), speed of separation has to be calculated.
In a perfectly inelastic collision the relative speed of separation is zero (objects stick together after collision and treated as one object)
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