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A 10.0-kg mass is placed on a 25.0° incline and friction keeps it from sliding. The coefficient of static friction in this case is 0.580, and the coefficient of sliding friction is 0.520. What is the frictional force in this situation?
a. 41.4 N
b. 88.8 N
c. 46.2 N
d. 51.5 N

Why does using F= UkMG not work? The answer is A.
 
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