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Physics 19 Online
OpenStudy (anonymous):

the parking brake on a 2000kg cadillac has failed, and it is rolling slowly, at 1mph, toward a group of small children. Seeing the situation, you realize you have just enough time to drive your 1000kg Volkswagen head on into the cadillac and save the children. With what speed should you impact the cadillac to bring it to a halt?

OpenStudy (anonymous):

Two words for you CONSERVATION OF MOMENTUM!!.. (of is not a real word :P)

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