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A person pulls a block across a rough horizontal surface at a constant speed by applying a force F at a slight angle as shown. A free-body force diagram is drawn for the block. The arrows in the diagram correctly indicate the directions, but not necessarily the magnitudes of the various forces on the block A student states that F fk and Fv W (here W stands for weight, which we call Fc) since the velocity is constant and thus the net force is zero in both directions. What, if anything, is wrong with this? (Evaluate both statements.) HTMI Fdit
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