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Which of the following is not represented in correct unit

(1) $\frac{\text{Stress}}{\text{Strain}}=N\text{​}/\text{​}{m}^{2}$

(2) Surface tension = $N\text{​}/\text{​}m$

(3) Energy $=kg\text{​-​}m\text{​}/\text{​}\mathrm{sec}$

(4) Pressure $=N\text{​}/\text{​}{m}^{2}$