Which of the following statements 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 potential energy of a system corresponding to conservative intermal force is equal to negative of the work done by these forces.
C. If some of the internal 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 done by the internal forces is equal to the change in mechanical energy.

Answer

D

Explanation

Clear from definition