本题目来源于试卷: Differential Calculus，类别为 IB数学
[问答题]
A ladder of length 13 wjiy/- rsmo)brq5f635 ytu:u co1fm5 m rests os:a+g v +g-szen horizontal ground and leans against a vertical wall. The bottom of the ladder is pulled away frgvs e-: +sz+agom the wall at a constant speed of $1.2 \mathrm{~ms}^{-1}$ . Calculate the speed of descent of the top of the ladder when the bottom is 5 m away from the wall.
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