An open railroad car of mass 2500 kg is coasting with an initial speed of 14 m/s

Question

An open railroad car of mass 2500 kg is coasting with an initial speed of 14 m/s on a frictionless, horizontal track. It is raining and water begins to accumulate in the car. After some time, it is found that the speed of the car is only 11 m/s. How much water (in kilograms) has accumulated in the car?
An open railroad car of mass 2500 kg is coasting with an initial speed of 14 m/s on a frictionless, horizontal track. It is raining and water begins to accumulate in the car. After some time, it is found that the speed of the car is only 11 m/s. How much water (in kilograms) has accumulated in the car?

Explanation / Answer

momentum conservation

Pinitial = Pfinal

2500*14 = (2500+m)*(11)

=> m = 681.818181818 Kg

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