A 5-kg sled has an initial velocity of 3 m/s when a 33-kg child, at rest, mounts it at the top of a hill (treat like a 1-Dimensional Perfectly Inelastic Collision). The sled and child move down a frictionless slope (ℎ1 = 12 m) where a second child of same mass mounts the sled. The two children and sled continue down a second frictionless slope (ℎ1 = 18m). What is the velocity of the children and sled at the bottom of the second slope?
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