rod. The device is initially vertical and at rest when it starts to rotate clockwise.

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$($a$)$ After the combination rotates through $90$ degrees, what is its rotational kinetic energy $($in J$)?7$

$($b$)$ What is the angular speed $($in rad$/$s$)$ of the rod and ball?

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$($c$)$ What is the linear speed $($in $\frac{m}{s})$ of the center of mass of the ball?

$$ m$/$s

$($d$)$ How does it compare with the speed had the ball fallen freely through the same distance of $28\mathrm{.}9$ cm $?($Express your answer as a percentage of $v_{\text{f}\text{a}\text{l}\text{l}}.)$

$v_{\text{s}\text{w}\text{i}\text{n}\text{g}}$ is $-$Select$-q,\%.$