Question: Let hat{u} be the specific internal energy of a system moving along with the flow with a velocity vec{V}. What is the time rate of change of the total energy of the system per unit mass?
Options
A : hat{u}+frac{1}{2}vec{V}.vec{V}
B : frac{D}{Dt}(hat{u}+frac{1}{2}vec{V}.vec{V})
C : frac{partial}{partial t}(hat{u}+frac{1}{2}vec{V}.vec{V})
D : frac{D}{Dt}(hat{u}+vec{V}.vec{V})
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