. A driver is travelling  at 50 mph is 80 m from a wall ahead, if the driver applies the brake immediately at t=2 secs, and begins slowing down at 10m/s^2. a. Find the distance from the stopping point to the wall. b. Determine the braking time or the time during deceleration. c. Determine the average skid resistance, assuming brake efficiency of 70%.   2. A two lane road with design speed of 80 kph has horizontal curve of radius 480 m. Design the rate of superelevation. By how much should the outer edges of the pavement be raised with respect to the center line, if the pavement is rotated with respect to the center line and the width of the pavement at the horizontal curve is 7.5 m?

PROBLEM 1: A car travels a 10-degree inclined road at a speed of 20 ft/s. The driver then applies the break and tires skid marks were made on the pavement at a distance "s". If the coefficient of kinetic friction between the wheels of the 3500-pound car and the road is 0.5, determine the skid mark distance.

Problem 1. In deriving braking distance, we assume a constant acceleration/deceleration rate, a. In fact, AASHTO assumes constant acceleration a(t): = c (constant) in most of its design procedures. Although this is not entirely true, distances required for acceleration or deceleration can be realistic if appropriate values are chosen for the constant acceleration process. Linear acceleration a(t) = c₁t (t is time elapse and c₁ is jerk rate or rate of change) is a better approximation to the acceleration process. a) What is the practical stopping distance for a vehicle with initial speed 70 mph, if acceleration is described by a linear function of time using a(t) = -1.8t (t is time elapse in seconds). b) Use a constant acceleration rate to achieve the same stopping distance. What is this constant acceleration rate? Problem 2. A car hits a tree at an estimated speed of 25 mph on a 3 % upgrade. If skid marks of 120 ft are observed on dry pavement (coefficient of braking friction, fo…

the name of the course "Road Construction" Please Solve it as soon as possible. With clear handwriting. Thank you