A box of mass 4.9kg is pushed at a constant velocity from point P at the bottom of an inclined plane to point Q at the top. The box is pushed by a force of 64 N acting parallel to the slope. The slope is inclined at an angle of 20° to the horizontal and the box moves through a vertical height of 5.8 m. [Diagram shows a box on an inclined plane. Force 64 N acts parallel to the slope. Vertical height 5.8 m and angle 20° are shown.] What is the work done against the frictional force acting on the block between P and Q?

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