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Q. If the coefficient of kinetic friction between a 33 kg crate and the floor is 0.26, what horizontal force is required to move the crate at a steady speed across the floor? Which is 84 I just help with the last part

What horizontal force is required if µk is zero?

Q. A girl on a sled coasts down a hill. Her speed is 7.0 m/s when she reaches level ground at the bottom. The coefficient of kinetic friction between the sled's runners and the hard, icy snow is 0.040, and the girl and sled together weigh 644 N. How far does the sled travel on the level ground before coming to rest?

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