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Q3. A packing case rests on an inclined plane of 14°. A force of 1400 N acting parallel to and up the plane is applied and just moves the packing case up the incline.

When a force of 1510 N is applied to the same packing case but now horizontal and acting into the plane, the packing case also just moves up the incline. Determine EACH of the following:

(a) The coefficient of friction between the packing case and the plane;

(b) The mass of the packing case.