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A truck of mass 4500 kg moving at 10 m/s strikes the back of a car that is at rest. The car and occupants have

A truck of mass 4500 kg moving at 10 m/s strikes the back of a car that is at rest. The car and occupants have mass 950 kg.

  1. What is the speed of the car just after impact if the car and truck lock together?
  2. If the impact lasts 0.3 s, what is the average force on a 60-kg passenger in the car?

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