Answer
Please see the work below.
Work Step by Step
(a) We know that
$L=rmv$
$\implies [L]=[m][Kg][\frac{m}{s}]$
$[L]=kg.\frac{m^2}{s}$
(b) $L=\tau dt$
$L=rFdt$
$[L]=[m][N][s]$
(c) We know that
$J=[N][m]
=>L=[J][s]
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