If collision occurs between two elastic bodies does their kinetic energy decrease during the time of collision

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Q. Assertion :If collision occurs between two elastic bodies their kinetic energy decreases during the time of collision. Reason: During collision intermolecular space decreases and hence elastic potential energy increases.

Q. During an "elastic collision " ,
a) there is no loss of kinetic energy
b) the bodies are perfectly elastic
c) temporarily some of the kinetic energy is used to deform the bodies
d) after collision the bodies regain the original shape keeping the total energy constant

Answer carefully, with reasons :

(a) In an elastic collision of two billiard balls, is the total kinetic energy conserved during the short time of collision of the balls (i.e. when they are in contact) ?

(b) Is the total linear momentum conserved during the short time of an elastic collision of two balls ?

(d) If the potential energy of two billiard balls depends only on the separation distance between their centres, is the collision elastic or inelastic? (Note, we are talking here of potential energy corresponding to the force during collision, not gravitational potential energy).

Answer carefully, with reasons:

(a) In an elastic collision of two billiard balls, is the total kinetic energy conserved during the short time of collision of the balls (i.e. when they are in contact)?

(b) Is the total linear momentum conserved during the short time of an elastic collision of two balls?

Q. A particle moving with kinetic energy

E

makes an head on elastic collision with an identical particle at rest. During the collision

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