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A balky cow is leaving the barn as you try harder and harder to push her back in. In
coordinates with the origin at the barn door, the cow walks from x = 0 to x = 6.9 m as you
apply a force with x-component Fx=- [20.0 N + (3.0 N/m)x]. How much work does the force
you apply do on the cow during this displacement?

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