12.A solid ball of mass M and radius R starts from rest and rolls down a hill. Its center of mass drops a total distance h. What is the ball’s speed at the bottom of the hill under the influence of gravity with gravitational acceleration g?
(A)
(B)
(C)
(D)
(E)
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統計: A(2), B(0), C(0), D(0), E(2) #3427012
統計: A(2), B(0), C(0), D(0), E(2) #3427012