1. As an engineering expert, you are called as an court witness to analyze a serious auto accident between a car stopped at a traffic light (Car B, mB = 1900 kg) and a car (Car A, mA = 1500 kg) hiCng Car B from behind. Specifically, you need to determine
2.  if Car A was exceeding the posted speed limit when it hit Car B. (What you are assuming is that Car A didn't apply the brakes prior to the collision.) 
3. When the collision occurred, the cars became entangled and proceeded in a straight line. At the instant the collision occurred, both drivers locked their brakes. 
4. The skid marks leM by the Nres showed that the damaged cars traveled 8.25 m before coming to rest.
5.  You reasonably esNmate that the kineNc fricNon between the Nres and the road to be 0.65.
6. (a) Find the speed of Car A at an instant just before the collision. 
7. (b) The speed limit on the road is 40 mph (17.9 m/s). Was Car A exceeding that speed and, if so, by how much (in mph and m/s)? 
8. (c) Find the energy absorbed by the cars in the impact in kJ.
9. (d) EsNmate the iniNal force on Car B at the moment of impact (assuming the collision occurred over 0.5 s). 
10. (e) EsNmate the iniNal force on Car A at the moment of impact (assuming the collision occurred over 0.5 s).
11.  (f) Suppose it is determined from the datalogger on Car A that the driver had applied the brakes just before the impact. How would your findings be different? Explain. 
12. (g) If the road was wet, what would be different about your analysis? Explain.