$($a$)$ Calculate their final angular velocity, given each had an initial speed of $3\mathrm{.}00$ m$/$s relative to the ice. Each has a mass of $70$ kg$,$ and their centers of mass are $0\mathrm{.}750$ m from their locked hands. You may approximate their moments of inertia to be that of point masses at this radius.

rad$/$s

$($b$)$ Compare the initial and final kinetic energy.

$($initial energy $/$ final energy$)$