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6. Stacie, who has a mass of 45 kg, starts down a slide that is inclined at an angle of 45 with the horizontal. If the coefficient of kinetic friction between Stacie's shorts and the slide is 0.25, what is her acceleration? Try to first derive an expression for a in terms of the given variables (0, uk, g). 7. A 63-kg water skier is pulled at a constant speed up a 14.0 incline by a rope parallel to the incline with a tension of 311 N. a) What is the coefficient of kinetic friction between the skis and the incline? b) If the tension in the rope were increased to 511 N, determine the acceleration of the skier