An isolated rail car originally moving with speed $v_0$ on a straight, frictionles, level track contains a large amount of sand. $A$ release valve on the bottom of the car malfunctions, and sand begins to pour out straight down relative to the rail car. Is momentum conserved in this process?
An isolated rail car originally moving with speed $v_0$ on a straight, frictionles, level track contains a large amount of sand. $A$ release valve on the bottom of the car malfunctions, and sand begins to pour out straight down relative to the rail car. Is momentum conserved in this process?
- A
The momentum of the rail car alone is conserved
- B
The momentum of the rail car $+$ sand remaining within the car is conserved
- C
The momentum of the rail car $+$ all of the sand, both inside and outside the rail car, is conserved
- D
Both $(A)$ and $(C)$
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- [AIPMT 2009]
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