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a cart moves along a frictionless track on a rainy day. The rain falls straight down,...

a cart moves along a frictionless track on a rainy day. The rain falls straight down, and some of it lands in the open cart. The raindrops fall in such a way that they either land in the cart or do not hit it at all. There is no air resistance. Does the cart slow down, speed up, or maintains constant speed? Explain.

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Answer #1

By law of conservation of momentum

Product of mass and velocity remains constant. In other words, momentum remains constant. Mass is inversely proportional to the velocity of the cart.

As the mass of the cart increases due to rain drop falling in it, velocity of the new car mass system starts to decrease proportionally.

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