本题目来源于试卷: Differential Calculus，类别为 IB数学
[问答题]
The displacement, in centm*8j dmq;im8eww wyfu+ 83v*ojs: c1e f/x0 eafl y594hudmq pt30h+yimeters, of a particle from an origin, O , at time t seconds, is g 0qad4mh 1huy/ jt3sx+l e0e5f:f 9ypciven by $s(t)=t \sin 2 t-7 \sin t \cos t, 0 \leq t \leq 3$ .
1. Find the maximum distance of the particle from O .
2. Find the acceleration of the particle at the instant it changes direction for the the second time.
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