A) \[50\text{ }{{s}^{-1}}\]
B) \[\text{60 }{{s}^{-1}}\]
C) \[\text{75 }{{s}^{-1}}\]
D) \[\text{80 }{{s}^{-1}}\]
Correct Answer: D
Solution :
Velocity gradient \[=\frac{\Delta v}{\Delta y}\] where\[\Delta v\]is relative velocity between the layers and\[\Delta y\]is distance between the layers. Therefore velocity gradient \[=\frac{8.0}{0.1}=80.0\,{{s}^{-1}}\]
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