A 22.6-kilogram child emerges from the end of a tall playground slide at a speed of 7.65 m/s, where she collides head-on with

Question

A 22.6-kilogram child emerges from the end of a tall playground slide at a speed of 7.65 m/s, where she collides head-on with her 90.7-kilogram father, who is waiting at rest near the foot of the slide. The two grab each other, thereby "sticking together" in the collision. Immediately after the collision is complete, what is the final speed (in meters/second) of the father-and-child together?

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