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A box kg meters with constant speed on a rough inclined plane whose surface is 30...

A box kg meters with constant speed on a rough inclined plane whose surface is 30 ° with the horizontal. What is the magnitude of the work done by the friction force?

A box of mass M = 5 kg slides 10 meters with constant speed on a rough inclined plane whose surface is 30 ° with the horizontal. What is the magnitude of the work done by the friction force?
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