(a) A body of weight 55 N is placed on a rough horizontal plane. To just move the body on the horizontal plane, a pull of 4O N inclined at 15° to the horizontal plane is required. Find the coefficient...

Extracted text: (a) A body of weight 55 N is placed on a rough horizontal plane. To just move the body on the horizontal plane, a pull of 4O N inclined at 15° to the horizontal plane is required. Find the coefficient of friction. (3 Marks) (b) Determine the number of joints in a structure, if the total number of members in the structure is 9. (1 Mark) Enter your student ID in the box and upload your handwritten answers in the separate link provided.