The rod $\backslash ($ A B $\backslash )$ is attached to collars at its ends by ball$-$andsocket joints. Collar $\backslash ($ A $\backslash )$ has a velocity $\backslash ($ v$\_\{$A$\}=13\backslash$mathrm$\{$ft$\}/\backslash$mathrm$\{$s$\}\backslash )$ at the instant shown in $($Figure $1).$ Assume $\backslash ($ d$=3\backslash$mathrm$\{$ft$\}\backslash ).$

Determine the velocity of collar $\backslash ($ B $\backslash ).$

Express your answer in feet per second to three significant figures. Assume the positive direction is upward.

$\backslash [$

v$\_\{$B$\}=$

$\backslash ]$

:$/$s

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