13. Based on the information in the above narrative, if the cars fail to couple, and the flatcar rebounds at 0.0400 m/s [S], was the collision elastic? a. No, there is a 17.3% drop in kinetic energy. b. Yes, the rail cars bounced apart. C. It is impossible to determine from the minimal amount of information supplied. d. No, there is an 82.7% drop in kinetic energy. 14. Based on the information in the above narrative, if the cars couple upon impact, how much of the initial kinetic energy of the flatcar ends up as heat due to the coupling collision? a. 184 J c. 111 J b. 41.5 J d. 295 J