Two people are pulling on a stubborn mule. Person one is pulling the mule at 125 Newtons (at 60 degrees in the first quadrant) and person 2 is pulling the mule at 65 Newtons (at 75 degrees counterclockwise from the - x - axis in the second quadrant). a)find the single force that is equivalent to the the two forces. i solved for this and got the correct magnitude (177.1 N) and direction (75 degrees counterclockwise from the +x- axis) I'm having problems with part b) whis wants the force and direction that a third person would have to exert on the mule to make the net force equal to zero. any advice? for part a i used vectors to solve the problem, but I'm not certain how to find the force for the third person .