8) A 2.3-kg object traveling at 6.1 m/s collides head-on with a 3.5-kg object traveling in the opposite direction at 4.8 m/s. If the collision is perfectly elastic, what is the final speed of the 2.3-kg object? A) 0.48 m/s B) 7.1 m/s C) 3.8 m/s D) 4.3 m/s E) 6.6 m/s