An open-topped freight car with mass 24,000 kg is coasting without friction along a level track. It is raining very hard, and the rain is falling vertically downward. Originally, the car is empty and moving with a speed of 4 m/s
(a) What is the speed of the car after it has collected 3000 kg of rainwater?
(b) Since the rain is falling downward, how is it able to affect the horizontal motion of the car?
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