What is the work-energy principle?
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The work-energy principle describes that the kinetic energy of a rigid body increases if an equal quantity of positive work is done on the body by the applied force acting on it. On the other hand, a reduction in kinetic energy is caused by an equal quantity of negative work done by the applied force. Therefore, if the total work is positive, the kinetic energy of the body increases by the quantity of work. If the total work done is negative, then the body’s kinetic energy decreases by the quantity of work.