A 37.5 kg box initially at rest is pushed 5.10 m along a rough, horizontal floor with a constant applied horizontal force of 140 N. If the coefficient of friction between box and floor is 0.300, find the following. (a) the work done by the applied forceJ(b) the increase in internal energy in the box-floor system due to frictionJ(c) the work done by the normal forceJ(d) the work done by the gravitational forceJ(e) the change in kinetic energy of the boxJ(f) the final speed of the boxm/s

fgravity=10x10=100n case 1

fgravity=30x20=600n case 2

6 times more

its c i just checked it

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