If you don't solve this problem correctly in $3$ tries, you can get a hint.

A baseball pitcher throws the ball in a motion where there is rotation of the forearm about the elbow joint as well as other movements. If the linear velocity of the ball relative to the elbow joint is $\backslash (21\mathrm{.}0\backslash$mathrm$\{$~m$\}/\backslash$mathrm$\{$s$\}\backslash )$ at a distance of $0\mathrm{.}439$ m from the joint and the moment of inertia of the forearm is $\backslash (0\mathrm{.}561\backslash$mathrm$\{$~kg$\}\backslash$mathrm$\{$~m$\}^\{2\}\backslash )$ what is the rotational kinetic energy of the forearm? $(1)$ J