The alarm at a fire station rings and a 71.3-kg fireman, starting from rest, slides down a pole to the floor below (a distance of 3.63 m). Just before landing, his speed is 1.42 m/s. What is the magnitude of the kinetic frictional force exerted on the fireman as he slides down the pole? So Givens: m = 71.3 kg d = 3.63 m Vf = 1.42 m/s g = 9.8 m/s^2 a = Fnet/m Ff = (coefficient of friction)(Fn) I have absolutely no clue how to start this problem. please help!