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When a Crate of Mass M Is Dragged a Distance

Question 16

Multiple Choice

When a crate of mass m is dragged a distance d along a surface with coefficient of kinetic friction μk, then dragged back along the same path to its original position, the work done by friction is


A) 0.
B) −μkmgd.
C) +μkmgd.
D) −2μkmgd.
E) +2μkmgd.

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