posted by Alex .
An open railroad car of mass 2445 kg is coasting with an initial speed of 22 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 5 m/s. How much water (in kilograms) has accumulated in the car?
conservation of momentum applies
solve for Mass rainwater M in kilograms.