Question
Two hockey pucks collide on a flat, horizontal rink. A red puck of mass 15 g is initially stationary. A blue puck of mass 12 g approaches it at 2.5 m/s to the left. If the collision is perfectly elastic, what are the final velocities of both pucks?
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Evidence boundary
This is Example 9.11 with unequal masses, not the equal-mass Example 9.8. The source uses an ideal, one-dimensional, perfectly elastic collision with negligible external impulse. The two quoted final speeds retain the source solution's rounding; exact intermediate values are provided for verification. Figure 9.20 is fully described by the one-dimensional text, with no extra angles or coordinates inferred.