Rockfalls can cause major damage to roads and infrastructure. To design mitigation bridges and barriers, engineers use

Question:

Rockfalls can cause major damage to roads and infrastructure. To design mitigation bridges and barriers, engineers use the coefficient of restitution to model the behavior of the rocks. The rock A falls a distance of 20 m before striking an incline with slope Î± = 40Â°. Knowing that the coefficient of restitution between A and the incline is 0.2, determine the velocity of the rock after the impact.