A) \[{{F}_{a}}=\left( \frac{W-{{W}_{r}}}{g} \right)f\]
B) \[{{F}_{a}}=\left( \frac{W+{{W}_{r}}}{g} \right)f\]
C) \[{{F}_{a}}=\left( \frac{W}{g} \right)f\]
D) \[{{F}_{a}}=\left( \frac{{{W}_{r}}}{g} \right)f\]
Correct Answer: B
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