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Q. A 925 N crate is being pulled across a level floor by a force F of 325 N at an angle of 25° above the horizontal. The coefficient of kinetic friction between the crate and the floor is 0.25. Find the acceleration of the crate.

Q. Three electrons form an equilateral triangle 2.6 nm on each side. A proton is at the center of the triangle. What is the potential energy of this group of charges?

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