A) Momentum is conserved in all collisions but kinetic energy is conserved in elastic collisions
B) Momentum is not conserved in all collisions but kinetic energy is conserved in all collisions
C) Both momentum and kinetic energy an conserved in all collisions
D) Neither momentum nor kinetic energy is conserved in elastic collisions
Correct Answer: A
Solution :
Whenever there is a collision between two bodies the total momentum of the bodies remains conserved. But if after collision of the two bodies, the total kinetic energy of the bodies remains the same as it was before collision, then it is a perfectly elastic collision. While if the two bodies stick together after collision, then the collision is said to be perfectly inelastic. In this collision most of ±e kinetic energy is lost as heat, thus kinetic energy is not conserved in perfectly inelastic collision.
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