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Given:

Weight: 5000 N

Coefficient: 0.4

Angle of the plane: 20º

Solve for the required FORCE to move the box (5,000N) upward to the plane.

This is the formula I used:

Fn=Ff

Fn(sin theta) = (coefficient)(5000 N - normal force)(cos theta)

Fn = (coefficient)(5000 N - normal force)(cos theta)/sin theta

**Fn = 5, 494.95 N**

Am I right or wrong?

Thanks for the help.