$\left[ {M{L^2}{T^{ - 2}}} \right] = {\left[ {ML{T^{ - 2}}} \right]^a}{\left[ {L{T^{ - 2}}} \right]^b}{\left[ T \right]^c}$
$\left[ {M{L^2}{T^{ - 2}}} \right] = \left[ {{M^a}{L^{a + b}}{T^{ - 2a - 2b + c}}} \right]$
$\therefore $ $a = 1$, $a + b = 2$ $⇒$ $b = 1$
and $ - 2a - 2b + c = - 2\;\; \Rightarrow \;c = 2$
$\therefore $ $E = KFA{T^2}$.