The alarm at a fire station rings and a 84.5-kg fireman, starting from rest, slides down a pole to the floor below (a distance of 4.47 m). just before landing, his speed is 1.49 m/s. what is the magnitude of the kinetic frictional force exerted on the fireman as he slides down the pole?

An electron and a proton are held on an x axis, with the electron at x = + 1.000 m and the proton at x = - 1.000 m. part a how much work is required to bring an additional electron from infinity to the origin? express your answer with the appropriate units. part b if, instead of the second electron coming in from infinity, it is initially at x = + 20.00 m on the axis and is given an initial velocity of 100.0 m/s toward the origin, does it reach the origin? part c how close to the origin does it come?