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# In the before part of Fig. 9-60, car A (mass 1100 kg) is

## Problem 56 Chapter 9

Fundamentals of Physics | 10th Edition

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Problem 56

In the before part of Fig. 9-60, car A (mass 1100 kg) is stopped at a traffic light when it is rear-ended by car B (mass 1400 kg). Both cars then slide with locked wheels until the frictional force from the slick road (with a low mk of 0.13) stops them, at distances dA ! 8.2 m and dB ! 6.1 m. What are the speeds of (a) car A and (b) car B at the start of the sliding, just after the collision? (c) Assuming that linear momentum is conserved during the collision, find the speed of car B just before the collision. (d) Explain why this assumption may be invalid.

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