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11. A box with a mass of 22 kg is at rest on a ramp inclined at 45 (degrees) to the horizontal. The coefficients of friction between the box and the ramp are: (mu(s): o.78 and mu(k): o.65)

a) Determine the magnitude of the largest force that can be applied upward parallel to the ramp, if the box is to remain at rest.

Fa = Fgsin45(degrees) - mu(k)Fncos45(degrees)

=53.4N

b) Determine the magnitude of the smallest force that can be applied onto the top of the box, perpendicular to the ramp, if the box is to remain at rest.

Fa= Fgsin45(degrees) + mu(s)Fncos45(degrees)

=271.324N

So tell me, where di I go wrong?