If a Mack truck and a Volkswagen have a head-on collision, which vehicle will experience the greater impact force?
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Both will experience the same impact force, in accord with Newton's 3rd law. The force that body A exerts on body B is equal and opposite to the force that body B exerts on body A. The effects of these forces, however, are quite different --- note from Newton's 2nd law
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So the car decelerates much more than the massive truck.
With that being said, sucks to be this dude:
http://www.aww-kittah-aww.com/up/pub...1/P1011439.jpg
http://www.aww-kittah-aww.com/up/pub...2/P1011440.jpg
http://www.aww-kittah-aww.com/up/pub...3/P1011442.jpg
http://www.aww-kittah-aww.com/up/pub...4/P1011447.jpg
http://www.aww-kittah-aww.com/up/pub...5/P1011448.jpg