本题目来源于试卷: Differential Calculus，类别为 IB数学
[问答题]
A ladder of length 13 k0ts qa kqmgx 1;.;ogx1aty64m restssfce/338mw*jyg0 d q s on horizontal ground and leans against a vertical wall. The bottom of the ladder is sj 38swq*0e3dgc/ mfy pulled away from 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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