In Fig. $6-8,,$&$1$ :$200$ cm$,$ fi$2$: t$-5$Q cm$,$ arid at I the $3\mathrm{.}00-9$ bead has a downward speed along the wire of

$800$ cm$/$s$.($a$)$ How fast is the bead moving as it passes point B if iriction is negligible? $($D$)$ How much energy

did the bead lose to friction work if it rises to a height of $20\mathrm{.}0$ cm above C aflter it ieaves the wire?