3. A particle moves along a vertical circular track of radius R. The circular track is smooth and has zero friction. The only forces acting on the particle are gravity and the normal force from the track. During its motion, the particle's maximum speed is 6/5 times its minimum speed. What is the minimum speed of the particle? (Gravitational acceleration g)
(A)
(B)
(C)
(D)
(E)

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