Which of the following concerning uniform circular motion is true? a) The centrifugal force is the action-reaction pair of the centripetal force. b) Unlike the centrifugal force, the centripetal force is a type of force similar to that of friction, gravity, and tension forces. c) The velocity of the object in motion changes, whereas the acceleration of the object is constant. d) A satellite undergoing uniform circular motion is falling towards the center in a circular path.

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