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5. Calculate the acceleration of a 2 kg block across a table if you push with a force of 20 N and the frictional force is 4 N. 6. A smooth wooden block is placed on a smooth wooden tabletop. You must exert a 14.ON force to keep the 40.ON block moving at constant velocity. a. What is the coefficient of sliding friction? b. If a 20.ON brick is placed on the block, what force will be required to keep the block and brick moving at constant velocity