本题目来源于试卷: Differential Calculus，类别为 IB数学
[问答题]
The displacement, ins-v j 0s4gx5rorjiac*2eyu 3 n-n )hf192q 0kye3 )kg ndp.fyu centimeters, of a particle from an origin, O , at time t sefy. n23e yp0kug q9dk)conds, 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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