A ball sits at rest on a horizontal table top. Which of the following statements explains why the ball stays at rest? a. the force of gravity on the ball is balanced by the normal force. b. the upward force that the table top exerts on the ball is equal and opposite to the downward force of the ball on the table. c. the upward force that the ball exerts on the table is balanced by the force of gravity on the ball. d. the downward force that the ball exerts on the table top is balanced by the force of gravit

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