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Q. A 10.0 kg box starts at rest and slides 3.5 m down a ramp inclined at an angle of 20 degrees with the horizontal. if the coefficient of friction between the ramp surface and the crate is 0.18, what is the velocity of the crate at the bottom of the ramp?

Q. A man takes his dog out for a walk. The dog has no legs and is dragged along the sidewalk on a little sled (mass of dog + sled = 13.0kg). The sidewalk exerts a frictional force of 14.0N. If the man pulls the leash at an angle of 55 degrees and the dog moves at constant velocity, what is the coefficient of friction between the sled and side walk?

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