Answer / cephus

For a perfectly elastic collission
velocity of seperation=velocity of approach and for
perfectly inelastic collission velocity of seperation =0;

bodies are neither perfectly elastic or inelastic.

in that case
velocity of seperation=e where e=velocity of approach;

where 0<e<1 constant e depends on materials of colloiding
bodies.
This constant is known as "coefficient of restitution".

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