本题目来源于试卷: Differential Calculus，类别为 IB数学
[问答题]
A particle moves such k*r7) h-gak ;4lzgu jnthafq(rsoknfg*g / t7.wn/8moxz m4h:6ht 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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