1. A child whose mass is 60 kg is skating on a frozen child pond with a velocity of 3 m/s. The child lands on a frictionless 15 kg sled, which is at rest on the ice, and holds on. ice sled (Assume that the ice is frictionless). a. Consider the system of the sled and the child. Note there is no net outside force acting on system. Which statement is true? the momentum of the child is the same before and after the child lands on the sled. • the momentum of the sled is the same before and after the child lands on the sled. • the total momentum of the system of the sled and child are the same before and after the child lands on the sled. b. Use your conclusion from (a) to determine the speed of the sled with the child on it.

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1. A child whose mass is 60 kg is skating on a frozen
child
pond with a velocity of 3 m/s. The child lands on a
15 kg sled, which is at rest on the ice, and holds on.
frictionless
ice
sled
(Assume that the ice is frictionless).
a. Consider the system of the sled and the child. Note there is no net outside force acting on system. Which
statement is true?
• the momentum of the child is the same before and after the child lands on the sled.
• the momentum of the sled is the same before and after the child lands on the sled.
• the total momentum of the system of the sled and child are the same before and after the child lands on the
sled.
b. Use your conclusion from (a) to determine the speed of the sled with the child on it.
c. What is the magnitude and direction (left/right) of the change in momentum of the child during the collision?
d. What is the magnitude and direction of the change in momentum of the sled?
e. If the collision lasted 0.2 seconds, what was the magnitude and direction of the average horizontal force on the
child during the collision?
f. What is the average horizontal force on the sled during the collision? What direction was it?
Transcribed Image Text:1. A child whose mass is 60 kg is skating on a frozen child pond with a velocity of 3 m/s. The child lands on a 15 kg sled, which is at rest on the ice, and holds on. frictionless ice sled (Assume that the ice is frictionless). a. Consider the system of the sled and the child. Note there is no net outside force acting on system. Which statement is true? • the momentum of the child is the same before and after the child lands on the sled. • the momentum of the sled is the same before and after the child lands on the sled. • the total momentum of the system of the sled and child are the same before and after the child lands on the sled. b. Use your conclusion from (a) to determine the speed of the sled with the child on it. c. What is the magnitude and direction (left/right) of the change in momentum of the child during the collision? d. What is the magnitude and direction of the change in momentum of the sled? e. If the collision lasted 0.2 seconds, what was the magnitude and direction of the average horizontal force on the child during the collision? f. What is the average horizontal force on the sled during the collision? What direction was it?
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