The pre-collision conditions for two elastic collisions are shown in ▶ Figure 6.14. What are the final velocities in each case? THINKING IT THROUGH. These collisions are direct applications of Equations 6.14 and 6.15. Notice that in (a) the 4.0-kg object will overtake and collide with the 1.0-kg object.

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= + 10 m/s My 020 m2= 1.0 kg = + 5.0 m/s m = 4.0 kg (a) P =+ 6.0 m/s =-60 m/s 020 m-2.0 kg m2-4.0 kg (b) A FIGURE 6.14 Collisions (a) Overtaking and (b) coming together. See Example 6.11 for description.