The workWdone by a constant forceacting on an object is where Fis the magnitude of the force, sis the magnitude of the displacement, and θis the angle between the force and the displacementvectors. Workis a scalarquantity and can be positive or negative, depending on whether the force has a componentthat points, respectively, in the same direction as the displacement or in the opposite direction. The work is zero if the force is perpendicular θ= 90 ° to the displacement.The kinetic energyKE of an object of massmand speed vis The work–energy theoremstates that the workWdone by the net external forceacting on an object equals the difference between the object's final kinetic energyKEfand initial kinetic energy KE0: W= KEf- KE0. If the net force does positive work, the kinetic energy increases; if the net force does negative work, the kinetic energy decreases.The work done by the force of gravityon an object of massmis where h0and hf
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