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What is the difference between perfectly elastic collision and perfectly inelastic collision?

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The objects must have similar masses for a collision to be perfectly elastic, while inelastic collisions can occur regardless of mass.

Only momentum is conserved in perfectly elastic collisions, while only kinetic energy is conserved in perfectly inelastic collisions.

Both momentum and kinetic energy are conserved in perfectly elastic collisions. While in perfectly inelastic collisions, momentum is conserved but not kinetic energy.

Perfectly elastic collisions only occur between microscopic objects, while perfectly inelastic collisions are more common for