A freight car in a park moves along a frictionless level railroad track at constant speed. The freight car is open on top. A kid who was hanging on a branch of a tree that is over the track. As soon as the car passes under the branch, the kid let go of the branch and landed on the car. What happens to the speed of the freight car? Group of answer choices
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A freight car in a park moves along a frictionless level railroad track at constant speed. The freig...
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