In which of the cases in physics we can apply the formula work done= change in kinetic energy and work energy theorm?

Q. Assertion :The change in kinetic energy of a particle is equal to the work done on it by the net force. Reason: Change in kinetic energy of particle is equal to the work done only in case of a system of one particle.

Q. In case of a non rigid body, work done by an external force is equal to change in its kinetic energy.

Q. Assertion :Work done by friction force in case of pure rolling,is equal to change in rotational energy. Reason: Ratio of kinetic energy of rotation to kinetic energy of translation is fixed for every case.

Q. Change in kinetic energy of a particle is equal to work done on it

Q. Work done by internal and external forces is equal to change in the kinetic energy of the system.