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# a ball rolls down a 100m.the hill is inclined at 60 degrees. if the ball has a rotational inertia of 10kg-m^2 and starts from rest, what is the final...

a ball rolls down a 100m.the hill is inclined at 60 degrees. if the ball has a rotational inertia of 10kg-m^2 and starts from rest, what is the final rotational speed of the ball?(you must use the conservation of energy)