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a) Of the total kinetic energy of the sphere, what fraction is translational?

b) Suppose now that there is no frictional force between the sphere and the incline. Now, what is the translational kinetic energy of the sphere at the bottom of the incline?

I figured out that KEtran is 65.8 j. I figured out that the phere reaches the bottom of the ramp at a speed of 5.08. the magnitude of friction forceon the sphere is 6.25 N. I just dont know what to do for a or b...any help?