[A]When a conservative force does positive work on a body, the potential energy of the body increases.

[B]Work done by a body against friction always results in a loss of its kinetic energy.

[C]The rate of change of total momentum of a many particle system is proportional to the sum of the internal forces on the system.

[D]In an elastic collision kinetic energy of the colliding bodies before collision is equal to kinetic energy during collision