A girl stands next to a sled on a frictionless horizontal surface. Both the girl and the sled are initially at rest. The girl’s mass is 50 kg and the sled’s mass is 8.5 kg. The girl pushes on the sled, causing it to move away at a speed of 17 m/s. What is the speed that the girl attains as a result of her push on the sled?
conservation of momentum
m1v1 + m2v2 = 0
50*v1 + 8.5*17 = 0
v1 = 2.89 m/s
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