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10a.6 A 20.0-kg crate is moving to the right on the floor with a speed of 50.0 m/s. A pulling force of a 20 N

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10a.6 A 20.0-kg crate is moving to the right on the floor with a speed of 50.0 m/s. A pulling force of a 20 N to the left is added to the crate. The coefficient of kinetic friction between the crate and the floor is 0.4. What is the speed of the crate after 2.0 s? [Answer: 40 m/s]

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