blue-eyed-chick
New member
...0.9 mph, toward a group of sm? The parking brake on a 2100 kg Cadillac has failed, and it is rolling slowly, at 0.9 mph, toward a group of small children. Seeing the situation, you realize you have just enough time to drive your 1070 kg Volkswagen head-on into the Cadillac and save the children. With what speed should you impact the Cadillac to bring it to a halt?