The coefficient of average rolling friction of a road is $f_{r}$ and its grade is +G\%. If the grade of this road is doubled, what will be the percentage change in the braking distance (for the design vehicle to come to a stop) measured along the horizontal (assume all other parameters are kept unchanged)?

(A) $\frac{0.01 G}{f_{r}+0.02 G} \times 100$

(B) $\frac{f_{r}}{f_{r}+0.02 G} \times 100$

(C) $\frac{0.02 G}{f_{r}+0.01 G} \times 100$

(D) $\frac{2 f_{r}}{f_{r}+0.01 G} \times 100$

The coefficient of average rolling friction of a road is $f_{r}$ and its grade is +G\%. If the grade of this road is doubled, what will be the percentage change in the braking distance (for the design vehicle to come to a stop) measured along the horizontal (assume all other parameters are kept unchanged)?

(A) $\frac{0.01 G}{f_{r}+0.02 G} \times 100$

(B) $\frac{f_{r}}{f_{r}+0.02 G} \times 100$

(C) $\frac{0.02 G}{f_{r}+0.01 G} \times 100$

(D) $\frac{2 f_{r}}{f_{r}+0.01 G} \times 100$

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