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Compute all parts of given question:
Question: A 25 N block rests on a horizontal surface. The coefficients of static and kinetic friction between the surface and the block are 0.8 and 0.3, respectively. A horizontal string is attached to the block and a constant tension is maintained in the string.
Part A: What is the force of friction acting on the block if the tension is 14 N? Answer in units of N
Part B: What is the force of friction acting on the block if the tension is 41 N? Answer in units of N
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