(Solved): help please A vertical parabolic sag curve 135m long has tangent grade of 1.7% and +2.3%. Find ...

A vertical parabolic sag curve $135\mathrm{m}$ long has tangent grade of $?1.7\%$ and $+2.3\%$. Find the sag distance, in $\mathrm{m}$. a. 154.6 b. 159.5 c. 135.3 d. 149.3 10. Problem A vertical parabolic sag curve $135\mathrm{m}$ long has tangent grade of $?1.7\%$ and $+2.3\%$.Determine the maximum speed in mph, that a car could travel on this curve if the sight distance is $150\mathrm{m}$. a. 81.5 b. 78.1 c. 69.2 d. 72.6 11. Problem A vertical parabolic sag curve $135\mathrm{m}$ long has tangent grade of $?2\%$ and $+3\%$. If the sight distance is $179.4\mathrm{m}$ at what maximum speed can a car pass thru the curve, in mph? a. 77.4 b. 83.5 c. 80.9 d. 92.6 12. Problem 50 mph is the design speed on a vertical summit curve connecting a $+2\%$ grade with a $2\%$ grade on a highway. Using a perception reaction time of 2.5 s and coeff of friction of 0.30 determine the minimum length of the vertical curve. a. $196.2\mathrm{m}$ b. $175.6\mathrm{m}$ c. $168.5\mathrm{m}$ d. $185.4\mathrm{m}$ 13. Problem A vertical summit curve connects a $2.2\%$ grade with a $?1.8\%$ grade. If the stopping sight distance is $100\mathrm{m}$, find the length of the curve. a. $79.3\mathrm{m}$ b. $85.6\mathrm{m}$ c. $93.3\mathrm{m}$ d. $99.5\mathrm{m}$