本题目来源于试卷: Kinematics，类别为 IB数学
[问答题]
The displacement, in centimeters,gdi 4ji ntkw*lo9f86n/1x- ef of a paeb// jsdrz +u6jc 1gd92 zmk0crticle from an origin, O , at time t seconds, is given by /+/src1 d269eg udkczjjb z0m $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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