Point out the correct alternative: (a) When a conservative force does positive work on a body, the potential energy of the body;increases/decreases/remains unaltered. (b)Work done by a body against friction always results in a loss of its kinetic/potential energy. (c) The rate of change of total momentum of a many particle system is proportional to the external force/sum of the internal forces of the system. (d) In an inelastic collision of two bodies, the quantities which do not change after the collision are the total kinetic energy/total linear momentum/total energy of the system of two bodies.

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