14. In the figure, a constant external force P = 130 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 7 s. If at the beginning of the movement the velocity is and at the end of the 7 seconds it is, the work done by the external force P is approximately: choose an answer A B C D E 720 J 900 J 520 J 810 J 620 J

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