Abdel was driving his fiat uno of mass 500kg and he wasn\'t paying attention. He

Question

Abdel was driving his fiat uno of mass 500kg and he wasn't paying attention. He drives straight into the rear of a stationary 7-series BMW of mass 2000kg. After the collision the 2 cars stick together and travel a short distance. The police determine that the velocity of the 2 cars after the collision was 10ms^-1 . The speed limit on that road is 40ms^-1 and the police charge Abdel with speeding. He knows you're taking physics 1 class and so he asks you to help him prove that he wasn't speeding. Can you help him? Abdel was driving his fiat uno of mass 500kg and he wasn't paying attention. He drives straight into the rear of a stationary 7-series BMW of mass 2000kg. After the collision the 2 cars stick together and travel a short distance. The police determine that the velocity of the 2 cars after the collision was 10ms^-1 . The speed limit on that road is 40ms^-1 and the police charge Abdel with speeding. He knows you're taking physics 1 class and so he asks you to help him prove that he wasn't speeding. Can you help him?

Explanation / Answer

Momentum is same before and after, so, the speed of Abdel was (500+2000)*10 / 500 = 50ms^-1 > 40ms^-1

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