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The following problem is an example of one of the problem types randomly selected at Conservation of Mechanical Energy If a 82.2 kg box is pushed across the floor with a force of 316.8 N, what is its speed after 7.73 m if the coefficient of kinetic friction between the box and the floor is 0.23 and it is starting from rest? Suggestions / Method Hints: calculate the total work done pushing the box subtract off the nonconservative work (due to friction) the difference is equal to the change in kinetic energy since the box starts from rest, this is 1/2 m * v2 Answer: 4.973 m/s List of Problem Hints Next Solution