Answer:
(a) False. Total momentum and total energy of the entire system are conserved and not of individual bodies.
(b) False. The external forces acting on a body may change its energy.
(c) False. In case of a non-conservative force like friction, the work in the motion of a body over a closed loop is not zero.
(d) True. In an elastic collision, a part of the initial K.E. of the system always changes into some other form of energy.
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