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In the figure below, a constant external force P = 160 N is applied to a 20−kg box, which is on a rough horizontal surface. The force pushes the box a distance of 8.0 m, in a time interval of 4.0 s, and the speed changes from v1 = 0.5 m/s to v2 = 2.6 m/s. What is the work done on the box by friction? Express your answer in joules.

In the figure below, a constant external force P = 160 N is applied to a 20−kg box, which is on a rough horizontal surface. The force pushes the box a distance of 8.0 m, in a time interval of 4.0 s, and the speed changes from v1 = 0.5 m/s to v2 = 2.6 m/s. What is the work done on the box by friction? Express your answer in joules.

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In the figure below, a constant external force P = 160 N is applied to a 20 − k g box, which is on a rough horizontal surface.
The force pushes the box a distance of 8.0 m , in a time interval of 4.0 s , and the speed changes from v 1 = 0.5 m / s to v 2 = 2.6 m / s .
What is the work done on the box by friction? Express your answer in joules.

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