Work done by a conservative force on a system is equal to :

The change in kinetic energy of the system The change in potential energy of the system No change in total mechanical energy of the energy None of the above

The change in potential energy of the system

We know : dU = -dW ... where dU is the change in potential energy and dW is the work done by conservative forces Hence, work done by conservative forces on a system is equal to the negative of the change in potential energy.