A sphere of mass m and radius r starts at rest at the top of an inclined plane and rolls without slipping to the bottom, a height h below the starting point. The moment of inertia of a sphere is 2/5 mr^2,

a. Determine the speed of the sphere at the bottom of the plane.

b. How would your answer be modified if there were no friction at all on the plane surface,

A solid ball starting from rest rolls down an incline that is 3.0 m above the ground. What is its linear speed as it comes off the incline?