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Two cars have a head on- collision, bounce off each other, and their front end are...

Two cars have a head on- collision, bounce off each other, and their front end are smashed in. What time of collision is this?

a) Elastic collision where both momentum and energy is conserved.

b) A combination of elastic and inelastic collision where kinetic energy is conserved.

c) Inelastic collision where both momentum and energy is conserved.

d) A combination of elastic and inelastic collision where kinetic energy is not conserved.

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