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 μ_k, then dragged back along the same path to its original position, the work done by friction is

• A) 0.
• B) −μ_kmgd.
• C) +μ_kmgd.
• D) −2μ_kmgd.
• E) +2μ_kmgd.

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