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A 150 kg box is moving with constant speed on a rough surface under the effect of external force (F) as shown in figure.

A 150 kg box is moving with constant speed on a rough surface under the effect of external force (F) as shown in figure. If the friction force is 35 N, calculate the work done by the force (F) to move the box a distance of 7 m to the right? F e = 30

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