本题目来源于试卷: Differential Calculus，类别为 IB数学
[问答题]
A particle moves sucv*:zi;ej;x pck 1cvm kw2x6hk z 8/h5tyxc/ut ,vu0w/ h that its velocity v$ \mathrm{~m} \mathrm{~s}^{-1} $ is related to its displacement s $\mathrm{~m}$ by the equation v(s)=2$ \arctan (\cos s), 0 \leq s \leq \pi$ .
1. Find the particle's acceleration a $\mathrm{~m} \mathrm{~s}^{-2}$ in terms of s .
2. Using an appropriate graph, find the particle's displacement when its acceleration is 0.5$ \mathrm{~m} \mathrm{~s}^{-2}$ .
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