A 2% grade over a horizontal distance of 85 feet has a vertical rise of how many feet?

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To determine the vertical rise for a 2% grade over a horizontal distance of 85 feet, we can use the formula for calculating the rise given a percentage grade. The percentage grade is calculated as the vertical rise divided by the horizontal distance, multiplied by 100 to convert it into a percentage.

In this case, we can rearrange the formula to find the vertical rise. The vertical rise in feet can be calculated as follows:

Vertical rise = (Grade Percentage / 100) × Horizontal distance

Substituting the known values into this equation:

Vertical rise = (2 / 100) × 85 feet

This simplifies to:

Vertical rise = 0.02 × 85 feet

Calculating that gives:

Vertical rise = 1.7 feet

Therefore, the vertical rise over a 2% grade for a horizontal distance of 85 feet is indeed 1.7 feet, confirming the correctness of the answer.