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As a 2.0 kg box slides down a very rough incline, it lose 16.0 J of...

As a 2.0 kg box slides down a very rough incline, it lose 16.0 J of kinetic energy and 10.0 J of gravitational potential energy before it comes to rest on the incline. How much work did friction do on the box?

a. 6.0 J

b. -6.0 J

c. 26.0 J

d. -26.0 J

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