Physics

A car crash where the cars stick together is an example of a perfectly inelastic collision.

In a perfectly inelastic collision, the two objects collide and stick together after the collision. Momentum is conserved in this case, but kinetic energy is not. Some of the initial kinetic energy is lost due to deformation of the cars, conversion to heat, sound, etc. The fact that the cars remain together after the collision is a characteristic of a perfectly inelastic collision.

Option A

This is an example of an elastic collision. The balls move away from each other after the collision, indicating that the objects do not stick together and kinetic energy is conserved.

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