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Q. The joule $\times$ second is the unit of

Physical World, Units and Measurements

Solution:

Joule is the SI unit of work and second is the SI unit of time.
$\therefore $ [Work][Time] $=\left[ ML ^{2} T^{-2}\right][T]=\left[M L^{2} T^{-1}\right]$
[Angular momentum] $=[ML ^{2} T ^{-1}]$