本题目来源于试卷: Kinematics，类别为 IB数学
[问答题]
The displacement, in cet5mf:*ouo eudzf h,9.5so j+hntim;ox-qqho:; ;w5du ax6fmqt ; meters, of a particle from an origin, O , at time t d-ftaq h;; omo w ;q:;6x5quxmseconds, is given 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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