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Force applied to pushing a crate.

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A 1000 newton crate is being pushed across a level floor at a constant speed by a force of 300 newtons at an angle of 20 degrees below the horizontal
A-what is the coeffecient of kinetic friction between the crate and the floor.
B-if the 300 newton force is instead of pulling the block at an angle of 20 degrees above the horizontal
-What will be the acceleration of the crate assume that the coeffient of friction is the same as found in A.

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The two pages solution contains full force diagrams, solution strategy ( a list of steps necessary to reach a solution) and full derivation of the solution.

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