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6 A 30.0-kg crate is on the frictional floor. The coefficient of static friction between the crate and the floor is 0.7, and the coefficient

6 A 30.0-kg crate is on the frictional floor. The coefficient of static friction between the crate and the floor is 0.7, and the coefficient of kinetic friction is 0.5. (a) How much force do you need to apply horizontally to make it move? (b) Once the crate is in motion, how much force is needed to maintain the constant-velocity motion? [Answer: (a) 210 N, (b) 150 N]

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