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A constant horizontal force, just sufficient to start the block in motion, is applied. The acceleration of the block, in m/s 2, is: a. 0. b. 0.98. c. 3.3. d. 4.5. e. 8.9 . Ans. B . 6. An object moves in a circle at constant speed. The work done by the centripetal force is zero because: a. The displacement for each revolution is zero. b.