In statistically stationary turbulence, we are asked to show that the velocity (u(t)) and its first time derivative (frac partial u partial t) are ________ correlated, and (u(t)) and its second time derivative are ________ correlated.
1) positively, positively
2) positively, negatively
3) negatively, positively
4) uncorrelated, negatively

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s, and four $3
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