An open railroad car of mass 2500 kg is coasting with an initial speed of 14 m/s
ID: 1365575 • Letter: A
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