A novelty collision device, as shown in Figure 6.15, consists of five identical metal balls. When one ball swings in, after multiple collisions, one ball swings out at the other end of the row of balls. When two balls swing in, two swing out; when three swing in, three swing out, and so on – always the same number out as in. Suppose that two balls, each of mass m, swing in at velocity v and collide with the next ball. Why doesn’t one ball swing out at the other end with a velocity 2v?

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(a) (b) FIGURE 6.15 One in, one out See Example 6.13 for description.