20.0 kg block is being pushed forward on a flat surface with a force of magnitude 45.0 N against a frictional force of 13.0 N. (a) Draw a free-body diagram of the block.

 (b) What is the net force acting on the block? 
 (c) What is the change in kinetic energy after the force has pushed the block for 4.0 m? (d) How much work would it take to stop the block?

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