# In this collision $(K.E)_{initial} \neq (K.E.)_{final}$ Coefficient of restitution 0 < e < 1  As $(K.E)_{initial} > (K.E.)_{final}$ The loss in kinetic energy appears in other forms, such as heat, sound etc. Ex- Collision between two billiard balls. All majority of collision belong to this category.

1st and 3rd are correct. I'm not sure about 2nd

2nd is also correct

The sum of the total kinetic energy before collision is not equal to the sum of the total kinetic energy after collision

in inelastic collision k. e. is conserved

momentum is conserved whereas KE is not conserved as in elastic collision

In inelastic collision, KE is NOT CONSEVRED!!

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