While standing on a flat frozen lake, a 75 kg adult pushes a 25 kg child seated
ID: 1789357 • Letter: W
Question
While standing on a flat frozen lake, a 75 kg adult pushes a 25 kg child seated on a sled. Before the push, both adult and child are at rest; after the push, the child has a velocity of 6 m/s. Assuming that the ice is frictionless, what is the velocity of the adult after the push? Address the four assessment criteria that also form the recommended problem solving strategy. While standing on a flat frozen lake, a 75 kg adult pushes a 25 kg child seated on a sled. Before the push, both adult and child are at rest; after the push, the child has a velocity of 6 m/s. Assuming that the ice is frictionless, what is the velocity of the adult after the push? Address the four assessment criteria that also form the recommended problem solving strategy. While standing on a flat frozen lake, a 75 kg adult pushes a 25 kg child seated on a sled. Before the push, both adult and child are at rest; after the push, the child has a velocity of 6 m/s. Assuming that the ice is frictionless, what is the velocity of the adult after the push? Address the four assessment criteria that also form the recommended problem solving strategy.Explanation / Answer
According to the given problem,
Using the conservation of momentum principal,
Li = Lf
0 = Mu + mv
75*u + 25*6 = 0
u = - 2 m/s
u = 2m/s opposite the child direction.
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