railway RRB JE (CBT I + CBT II) Mock Test 2024 Fluid Mechanics Fluid Kinematics Streamline Function

यदि ψ = 2xy, (2, -2) पर परिणामी वेग का परिमाण (m/sec में) निम्न में से क्या है?

1
\(\sqrt2\)
2
-8
3
4
4
4\(\sqrt2\)
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