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

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Part A 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 decreases. The speed of the freight car remains the same. The speed of the freight car increases. The speed of the freight car cannot be determined from the information given. SubmitGive Up Part A 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 decreases. The speed of the freight car remains the same. The speed of the freight car increases. The speed of the freight car cannot be determined from the information given. SubmitGive Up Part A 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 decreases. The speed of the freight car remains the same. The speed of the freight car increases. The speed of the freight car cannot be determined from the information given. SubmitGive Up 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 decreases. The speed of the freight car remains the same. The speed of the freight car increases. 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 decreases. The speed of the freight car remains the same. The speed of the freight car increases. 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 decreases. The speed of the freight car remains the same. The speed of the freight car increases. The speed of the freight car cannot be determined from the information given. SubmitGive Up The speed of the freight car decreases. The speed of the freight car remains the same. The speed of the freight car increases. The speed of the freight car cannot be determined from the information given.

Explanation / Answer

Momentum has to remain same before the sand is dropped and after the sand is dropped.

momentum = mass x speed

as the sand is dumped , the mass increases , hence the speed has to decrease to keep the momentum constant.

speed of freight car decreases

The speed of the freight car decreases.

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