Kinetic energy

A collie drags its bed box across a floor by applying a horizontal force of 8.0 N. The kinetic frictional force acting on the box has magnitude 5.0 N. As the box is dragged through 0.70 m along the way, what are (a) the work done by the collie”s applied force and (b) the increase in thermal energy of the bed and floor?

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