本题目来源于试卷: Kinematics，类别为 IB数学
[问答题]
The displacement, in centimeters, of a par hlz3lxol5dh8 5o44uttuf2/(9 -fz qwx jiu1rticleeyfqf*d)n: (h from an origin, O , at time t seconds, qed(fhy n)*:f 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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