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A 40.0N box begins to slide from rest through a plane inclined at 25 degrees (with...

A 40.0N box begins to slide from rest through a plane inclined at 25 degrees (with respect to the horizontal) and which has a length of 7.00m. The coefficient of kinetic friction between the box and the plane is 0.138. Determine:
a) the kinetic energy of the box when it reaches the end of the inclined plane
b) the kinetic friction force
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