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For the surface mu=0.4 find the work don...


For the surface `mu=0.4` find the work done by the applied force, friction and net force.

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`W_(applied)=10xx5=50J`
Friction force `f=muN=0.4xx20=8N`
`W_f=-fd=-8xx5=-40J` (force and displacement are in opposite direction)
`W_(net)=(10-f)d=(10-8)xx5=10J`
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