VERY IMPOOORTANT! Two spheres of masses m, m` impinge. If the collision is direct and v is their relative velocity before impact e is the coefficient of restitution. Prove that the loss of kinetic energy by impact is:

Atypical jetliner lands at a speed of 146 mi/h and decelerates at the rate of (10.4 mi/h)/s. if the jetliner travels at a constant speed of 146 mi/h for 1.5 s after landing before applying the brakes, what is the total displacement of the jetliner between touchdown on the runway and coming to rest?