The VPI (vertical point of intersection) is $100 \mathrm{~m}$ away (when measured along the horizontal) from the VPC (vertical point of curvature). If the vertical curve is parabolic, the length of the curve (in meters and measured along the horizontal) is

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The VPI (vertical point of intersection) is $100 \mathrm{~m}$ away (when measured along the horizontal) from the VPC (vertical point of curvature). If the vertical curve is parabolic, the length of the curve (in meters and measured along the horizontal) is