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the rate of change of the grade of a parabolic summit curve is 0.5%. the grade...

the rate of change of the grade of a parabolic summit curve is 0.5%. the grade of ascending and descending tangents are 6% and -2.0% respectively. the elecation of VPT is 200 ft at Sta 15+80.
determine the:
a.) length of curve
b.) elecation of the summit
c.)location of the summit
d.)the vertical distance from VPI to the curve
e.)elevation at Sta 06+80
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