76. A string is attached to the rear-view mirror of a car. A ball is hanging at the other end of
the string. The car is driving around in a circle, at a constant speed. Which of the
following lists gives all of the forces directly acting on the ball?
(A) Tension
(B) Tension and gravity
(C) Tension, gravity, and the centripetal force
(D) Tension, gravity, the centripetal force, and friction
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