14. A 30 kg girl goes down a slide at an amusement park, reaching the bottom with a velocity of 2.5 m/s. The slide is 10.0 m long and the top end is 3.00 m above the ground, bottom is 0.300m above the ground. [8] (a) What is her gravitational potential energy at the top of the slide, relative to the bottom of the slide ? (b) What is her kinetic energy when she reaches the bottom? (c) How much energy is lost due to friction? (d) Calculate the coefficient of friction between her and the slide as she goes down