本题目来源于试卷: Kinematics，类别为 IB数学
[问答题]
The displacement, in centimeters, of a partni;mu sq 45s7iicle from an orio p*a;sj*m8,v, rsx*- )cadp nu zs7brgin, O , at time t seconds, is given byd bacx*vr m *p*p)rss-a, o7s,;u 8nzj $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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