### What is the force of friction opposing the motion of crate

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Q. A large crate has a mass of 214kg. A horizontal force of positive 202.0N is applied to it, causing it to accelerate at 0.130m/s2 horizontally. What is the force of friction opposing the motion of crate?

Q. A 9 m, 220 N uniform ladders rests against a smooth wall. The coefficient of static friction between the ladder and the ground is 0.55, and the ladder makes a 50° angle with ground. How far up the ladder can an 850 N person climb before ladder begins to slip?

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