As the train starts moving, the head of the passenger sitting inside leans backward because of

A. A raised hammer B. A bullet fired by the gun C. A moving stone D. A rotating wheel

A. Energy released by a moving object B. Energy emitted during mechanical work C. The sum of the kinetic energy and potential energy of an object D. Equal to the rate of work done

A. Force B. Energy C. Friction D. Power

A. Chemical energy B. Potential energy C. Kinetic energy D. Heat energy