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Derek pushes a 10kg crate along a rough surface with 35N of force. He observes that m it is only accelerating at a rate

Derek pushes a 10kg crate along a rough surface with 35N of force. He observes that m it is only accelerating at a rate of 2- What s must the value of the force of friction be? (Assume the only two forces acting on the object are friction and Derek).

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