Question

# select the correct alternative.

A
work done by kinetic friction on a body always results in a loss of its kinetic energy.
B
Work done on a body, in the motion of that body over a closed loop is zero for every force in nature.
C
Total mechanical energy of a system is always conserved no matter what type of internal and external forces on the body are present.
D
When total work done by a conservative force on the system is positive then the potential energy associated with this force decreased.

Solution

## The correct option is D When total work done by a conservative force on the system is positive then the potential energy associated with this force decreased.$$w=-\triangle u$$     (For conservative forces on the system)$$\triangle u=-w$$If work done is $$+ve$$,Then $$\triangle u=-ve$$ $$\therefore$$ Potential energy decreases.Physics

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