A freight car moves along a frictionless level railroad track at constant speed.

Question

A freight car moves along a frictionless level railroad track at constant speed. The freight car is open on the top. A large load of sand is suddenly dumped into the freight car. What happens to the speed of the freight car? A freight car moves along a frictionless level railroad track at constant speed. The freight car is open on the top. A large load of sand is suddenly dumped into the freight car. What happens to the speed of the freight car? The speed of the freight car remains the same. The speed of the freight car increases. The speed of the freight car decreases. The speed of the freight car cannot be determined from the information given. A freight car moves along a frictionless level railroad track at constant speed. The freight car is open on the top. A large load of sand is suddenly dumped into the freight car. What happens to the speed of the freight car? A freight car moves along a frictionless level railroad track at constant speed. The freight car is open on the top. A large load of sand is suddenly dumped into the freight car. What happens to the speed of the freight car? The speed of the freight car remains the same. The speed of the freight car increases. The speed of the freight car decreases. The speed of the freight car cannot be determined from the information given. A freight car moves along a frictionless level railroad track at constant speed. The freight car is open on the top. A large load of sand is suddenly dumped into the freight car. What happens to the speed of the freight car? The speed of the freight car remains the same. The speed of the freight car increases. The speed of the freight car decreases. The speed of the freight car cannot be determined from the information given. The speed of the freight car remains the same. The speed of the freight car increases. The speed of the freight car decreases. The speed of the freight car cannot be determined from the information given.

Explanation / Answer

speed of car decrease. (by applying conservation of momentum)

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