28. An object weighing 4 newtons swings on the end of a string as a simple pendulum. At the bottom of the swing, the tension in the string is 6 newtons. What is the magnitude of the centripetal acceleration of the object at the bottom of the swing?
(A) 0.5 g
(B) g
(C) 1.5 g
(D) 2.5 g
(A) 0.5 g
(B) g
(C) 1.5 g
(D) 2.5 g