A force of 20 N is applied horizontally to a 4.0-kg mass on a level...
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A force of 20 N is applied horizontally to a 4.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.30. If the mass is moved a distance of 15 m, what is the change in its kinetic energy?20 J61J46J124J
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