If momentum (\({p}\)), area (\({A}\)), and time (\({T}\)) are taken to be fundamental quantities, then energy has the dimensional formula:
1. \( {\left[{pA}^{-1} {~T}^1\right]} \) 2. \( {\left[{p}^2 {AT}\right]} \)
3. \( {\left[{pA}^{-1 / 2} {~T}\right]} \) 4. \( {\left[{pA}^{1 / 2} {~T}^{-1}\right]}\)