Catherine Ndereba is a pretty good half-marathon runner . So much so that she finds it too easy and is tired of filling her room with trophies and medals! In her last race she decided to tie a rock to her waist, to give the other runners a chance, and she still finished 1 ^ (st) !!! The rock had a mass of 4.0*10^ 1 kg and she ran at a constant velocity forwards while exerting an applied force of 155 N at 27'to the horizontal. Catherine even had time during the race to determine the coefficient of kinetic friction between the rock and the ground. What was her answer? Draw a FBD.