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Select the correct alternative
(1) Work done by kinetic friction on a body always
\( \mathrm{P} \) results in a loss of its kinetic energy.

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(2) Work done on a body, in the motion of that body over a close loop is zero for every force in nature.
(3) Total mechanical energy of a system is always conserved no matter what type of internal and external forces on the body are present.
(4) When total work done by a conservative force on the system is positive then the potential
\( f \) Laser Pointer this force decreases.
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