Question

4. (10pts) Rockfalls can cause major damage to roads and infrastructure. To design mitigation bridges and barriers. engincers use the coefficient of restitution to model the behavior of the rocks. From experimental tests. smaller boulders tend to have a greater coefficient of restitution than larger boulders. Rock A (initially at rest) falls a distance-of 20 meters before striking an incline with a slope of a 45 The coefficient of restitution is e 0.2, h = 30 m and d 20 m. Determine the velocity of the boulder as it leaves the incline. The velocity should be given as a magnitude and an angle referenced from the horizontal. Vine of impt Plane f Cantt Vi n Ex- 45 fech 20m om 2om h d

Answer 1

et inpact and y impackmatij angle usith Ationtal v be the as hen eiciantfeaitetion). e tonch = e eucos X - lislesy alarg the aperamaiss the aame U sina = dp tan e cota O'2 cot 45 45 + 1.309. -33.690° usin x9.8/KO - /9. 80.9 sin 45 45-33 630o COs