An object weighing 4 newtons swings on the end of a string as a simple pendulum. At the bottom 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. Centripetal Acc. = v^2/r Sum of forces = T+Ac=mg??? Attempt -T-mg=Ac? -6-4 = Ac I don't know where to go from here.