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1. Hey, please can you help me on this question, i am really stuck, i don't understand how to work it out:

3) A car crached into a lorry that was crossing a busy road. The speed limit on the road was 60 miles per hour (27 m/s). The following measurements were made by police officers at the scene of the crash:
• The car and lorry ended up 6m from the point of impact.
• The car's mass was 750kg and the lorry's mass was 2150kg.
• The speed of a vehicle for a braking distance of m is 9m/s.

3a) Use this speed to calculate the momentum of the car and the lorry immediately after the impact.

3b) use conservation of momentum to calculate the velocity of the car immediately before the collision.

3c) was the car travelling over the 60 mph speed limit before the crash?
2. you need to know the equations for velocity, and momentum

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Updated: April 10, 2013
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