3. A 15 kg box is pushed up a 35 ramp. A force of friction of l 10 N exists between the box and the ramp. a} Draw an FBD showing a tilted coordinate system (label positive x-direetion as well). [1 mark] b) What minhnum force, F, would be necessary to move the box up the ramp at a constant speed? [4 marks] \\" {r is 35