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a sled is pulled across a rough level floor at increasing speed. Which statement is true...

a sled is pulled across a rough level floor at increasing speed. Which statement is true about the forces acting on the sled? a: the normal force is doing positive work b: the kinetic friction is doing negative work c: the weight of the cart is doing positive work d: the pulling force is doing negative work?

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b: the kinetic friction is doing negative work

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