Posted by **Alisa** on Thursday, August 4, 2011 at 11:57am.

A vehicle travelling 30mph collides head-on with another vehicle travelling 50mph, the force of impact, theoretically, would be the same as a vehicle travelling:

A. 80mph hitting a cement wall

B. 80mph hitting a stopped vehicle

c. 50mph hitting a cement wall

d. 30mph hitting a cement wall

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