A 40 kg box initially at rest is pushed 5 m along a rough, horizontal floor with a constant applied horizontal?

Question

A 40 kg box initially at rest is pushed 5 m along a rough, horizontal floor with a constant applied horizontal force, the work done by the applied force is 650 J.  If the final speed of the box is 1 m/s,  find the work done by friction.

Pearlsawme · Accepted Answer

Work done by the applied force is 650J 
Kinetic energy gained by the box = 0.5*40*1*1 =20 J
Work lost due to friction= 650 - 20 = 630 J
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A 40 kg box initially at rest is pushed 5 m along a rough, horizontal floor with a constant applied horizontal?

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