Consider a child $($m$=30$ kg$)$ initially standing ad

the center of a turntable $($M $=300$ kg$)$ which is

rotating at rad$/$s$.$ After the child walks to the rim

of the turntable $($R $=2\mathrm{.}0$ m$),$ what is the new $?$

$$ We can consider $$child $+$ turntable$$ as a

single system.

$$ No external torques $$ L is constant