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# Homework help?

A box of mass 11.1 kg starts at rest and is pulled by a force of 20.0 N applied at an angle of 35.0º to the horizontal.

After being pulled a distance of 4.42 meters the velocity of the box is 1.75 m/s.

Use the work-energy theorem to find the net work done on the box.

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Update:

i also need to know the force of friction

### 1 Answer

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- oldschoolLv 72 months ago
A box of mass 11.1 kg starts at rest and is pulled by a force of 20.0 N applied at an angle of 35.0º to the horizontal. After being pulled a distance of 4.42 meters the velocity of the box is 1.75 m/s.

20*cos35*4.42 = Ff*4.42+ ½*11.1*1.75²

Work done on the box: ½*11.1*1.75² = 17J

(20*cos35*4.42 - ½*11.1*1.75²)/4.42 = Ff = 12.5N<<<

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