8) Car A hits car B from behind while going 38 m/s. Immediately after the collision, car B moves forward at 15 m/s and car A is at rest. What fraction of the initial kinetic energy was lost in the collision? 60% was lost (40% remains). 9) A 144-g baseball moving 28.0 m/s strikes a stationary 5.25-kg brick resting on small rollers so