5. In an improvised two-dimensional tug-of-war, three ropes are tied at one knot. Each of the three contestants applies a force of 900N on the end of his rope. The rope of the first contestant is directed straight to the east. The rope of the second contestant is directed 70 north of west. The rope of the third contestant is directed 70 south of west. Make a drawing of this situation and answer the questions by both graphical and numerical methods.