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justin, with a mass of 55kg, is going down an 8.0-m-high water slide tilted at a...

justin, with a mass of 55kg, is going down an 8.0-m-high water slide tilted at a constant but unknown angle. the coefficient of kinetic friction between him and the slide is 0.2. he starts at rest, and his speedat the bottom is 11m/s. the work done by the kinetic friction force during his descent is -984.5 J.

a) What is the work done by the normalforce during his descent?

b) What is the angle of the incline?

c) What is the work done by the gravitational force during his descent?

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