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A brick at rest on horizontal table is pulled by a horizontal cord, as shown in fig. 2 .
The force of frictlon on the brick.

A. Increase If the pull Increases hut the brick does not movo
B. Is directly horizontal to the right  
C. decreases If an Identical brick is placed on the first
D. Is zero if the brick is pulled hard enough to make it slide
E. change If the brick is turned on Its slde

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Correct Answer: B