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Q. The $SI $ unit of potential energy is

Physical World, Units and Measurements

Solution:

Dimension of potential energy = [Energy] $= ML ^{2} T ^{-2}$
$\Rightarrow $ $S.I. $ Unit of potential energy $= kg . m ^{2} s ^{-2}$
$= kg \left( ms ^{-1}\right)^{2}$