Question $(4)(2\mathrm{.}5$ points$)$

A curve is needed to connect a $-5\%$ grade to a $-1\%$ grade. The design speed is $45mph$ and the

acceptable deceleration rate is $10f\frac{t}{se{c}^2}.$ The driver's reaction time is $2\mathrm{.}5sec.$ For the curve, the

stopping sight distance $($SSD$)$ is most nearly $($you must show the steps needed to solve the problem$)$