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http://news.enquirer.com/apps/pbcs.dll/article?AID=/20080521/NEWS01/805210387
 
If my calcs are correct, an 80-ton trailer at 70 mph creates 26,200 ft-kips of energy.  (F = 1/2 mv^2 if my math serves me correctly... )  That is about 10k at 30".  Or am i way off?

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David Topete, SE