A 5.0-kg block rests on a 30 incline. The coefficient of static friction between the block and

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A 5.0-kg block rests on a 30° incline. The coefficient of static friction between the block and the incline is 0.20. How large a horizontal force must push on the block if the block is to be on the verge of sliding 

(a) Up the incline and 

(b) Down the incline?

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