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The parking brake on a 2400kg Cadillac has failed. and it is rolling slowly, at 1.2mph,...

The parking brake on a 2400kg Cadillac has failed. and it is rolling slowly, at 1.2mph, toward a group of small children. Seeing the situation, you realize you have just enough time to drive your 1000kg Volkswagon head-on into the Cadillac and save the children. With what speed should you impact the Cadillac to bring it to a halt?

___________mph
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