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Newton's Law: Frictional force exerted on Block A

See attached file for problem 65 only.

Find the frictional force exerted on Block A given that the mass of block A is 8.50kg, the mass of block b is 2.25 kg and the coefficient of static friction between block a and the the surface on which it rests is 0.320 (b) if the mass of block a is doubled does the frictional force exerted on it increase, decrease, or stay the same. explain Picture shows block a on a table pulling block b off of the floor attached to a ring at the wall with the rope at a 45 degree angle

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