Question

Please show all steps.

3. You are an insurance investigator called to the scene of a car accident. According to witnesses, a blue car (mass ms) was traveling south through an intersection when it was hit by a red car (mass m.) traveling east that ran a stop sign. You observe that the red car came to rest in the intersection. The blue car ended up a distance from the intersection, in a direction measured south of east. Determine the initial speed of each car and comment on the change in energy (if any) during the collision. (As a professional investigator, you are easily able to measure the coefficient of kinetic friction between a car and the ground to be u.)

Answer 1

Since there is no external force then the momentum of the system is conserved. By considering the momentum of the system before collision and just after collision, the initial velocities of the two cars can be calculated. Let V be the velocity of blue car just after collision. The blue car comes to rest after travelling L distance along the direction shown in the diagram. The change in energy (= final energy - initial energy) is also calculated.

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