Posted by **Jessica** on Wednesday, March 6, 2013 at 3:34am.

A sedan weighing 4000 pounds travelling at 30mph collides head on with a compact car weighing 2000 pounds and travelling in the opposite direction at 45 mph. What is the resultant velocity of the combined vehicles?

- Physical Science -
**drwls**, Wednesday, March 6, 2013 at 5:06am
Assume that the two cars stick together and appply that 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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