Which of the following statement is not true ?

Options

A. Work done by conservative force on an object depends only on the initial and final states and not on the path taken.
B. The change in the potential energy of a system corresponding to conservative internal forces is equals negative of the work done by these forces.
C. If some of the internal forces within a system are non`-` conservative , then the mechanical energy of the system is not constant.
D. If the internal forces are conservative,the work donw by the internal forces is equal to the change in mechanical energy.

Answer

D