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) A mass of 6 kg is resting on a horizontal with friction with a coefficient...

) A mass of 6 kg is resting on a horizontal with friction with a coefficient of
static friction of 0.71 and coefficient of kinetic friction of 0.30. A force of 9 N is
applied vertically upwards to the mass, and a force of 15 N is applied
vertically downwards to the mass. What is the maximum static frictional force
for this situation in Newtons?

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