由题意得:$\angle B=90^{\circ}$,
$\because BC=8m$,$BD=6m$,
$\therefore CD=\sqrt{B{C}^{2}+B{D}^{2}}=\sqrt{{8}^{2}+{6}^{2}}=10m$,
$\because AC=17m$,
$\therefore $绳子移动了$AC-DC=17-10=7\left(m\right)$,用时$10$秒,
$\therefore $工作人员拉绳子的速度是$7\div 10=0.7$米$/$秒.
由题意得:$\angle B=90^{\circ}$,
$\because BC=8m$,$BD=6m$,
$\therefore CD=\sqrt{B{C}^{2}+B{D}^{2}}=\sqrt{{8}^{2}+{6}^{2}}=10m$,
$\because AC=17m$,
$\therefore $绳子移动了$AC-DC=17-10=7\left(m\right)$,用时$10$秒,
$\therefore $工作人员拉绳子的速度是$7\div 10=0.7$米$/$秒.