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When two bodies collide elastic, then:...

When two bodies collide elastic, then:

A

`KE` of the system along is conserved

B

only momentum is conserved

C

both `KE` and momentum are conserved

D

neither `KE` nor momentum is conserved

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The correct Answer is:
C
In case of collision of two bodies (whether elastic or inelastic), as the impulsive force acting during collision is interval, hence the total momentum of the system always remain conserved . Further , if in a collision , kinetic energy after collision is equal to kinetic energy before collision. The collision is said to be elastic: otherwise inelastic.
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