Posted by Jessica on Wednesday, March 6, 2013 at 3:34am.
Assume that the two cars stick together and appply tht law of conservation of momentum.
4000*30 -2000*45 = 6000*Vfinal
Vfinal = (1.2*10^5 - 0.9*10^5)/6000
= 5.0 mph (in the original drection of the 4000 lb car).
I did not have to convert mass to slugs or velocities to ft/sec, because I used the same units for each term (lbmass*miles/h)
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