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A solid sphere of uniform density starts from rest and rolls without slipping a distance of d = 4 m down a q = 28° incline. The sphere has a mass M = 5.2 kg and a radius R = 0.28 m.

1.) What is the magnitude of the frictional force on the sphere?

Suppose now that there is no frictional force between the sphere and the incline.

2. ) Now, what is the translational kinetic energy of the sphere at the bottom of the incline?

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