A) \[\frac{dp}{dt}=\frac{({{h}_{g}}-{{h}_{f}})}{({{v}_{g}}-{{v}_{f}})}\]
B) \[\frac{dp}{dt}=\frac{({{h}_{g}}-{{h}_{f}})}{T\,({{v}_{g}}-{{v}_{f}})}\]
C) \[\frac{dp}{dt}=\frac{({{h}_{g}}-{{h}_{f}})}{T}\]
D) \[\frac{dp}{dt}=\frac{({{v}_{g}}-{{v}_{f}})T}{({{h}_{g}}-{{h}_{f}})}\]
Correct Answer: B
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