A body is freely moving under the action of a conservative force. If the work done by this conservative force is 'a', change in kinetic energy 'b' & magnitude of change in potential energy is 'c', then

Q. If work done by conservative force is X, change in potential energy is Y and change in kinetic energy during motion is Z, then which of the following is compulsorily true?

Q. Work done by a conservative force is equal to negative change in the potential energy of the system.

Q. A particle is taken from point A to point B under the influence of a force field. Now it is taken back from B to A and it is observed that the work done in taking the particle from A to B is not equal to the work done in taking it from B to A. If $W_{nc}$ and $W_c$ are work done by non-conservative and conservative forces present in the system, respectively, $\Delta U$ is the change in potential energy and $\Delta K$ is the change in kinetic energy, then

Q. Work done by gravitational force is equal to the change in magnitude of potential energy of the body.

Q. A particle is taken from point A to point B under the influence of a force field. Now it is taken back from B to A and it is observed that the work done in taking from A to B is not equal to the work done in taking from B to A. If $W_{nc}$ and $W_c$ are the works done by non-conservative forces and conservative forces present in the system respectively, $\Delta U$ is the change in potential energy, $\Delta K$ is the change in kinetic energy, then which of the following is wrong?