Afreight 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. it is impossible to determine whether the speed of the freight car increases or decreases from the information given.

Decrease in velocity

Explanation:

Given

Freight car is open from top and large load of sand is suddenly dumped in the car .

It will result in decrease in  velocity of car because momentum is conserved.

Initial momentum will be equal to final momentum so the of car velocity will decrease because combined mass of car and sand is more as compared to initial mass.

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