本题目来源于试卷: Kinematics，类别为 IB数学
[问答题]
A particle moves such thatpdjw eq*dg+, 8 vslpzf/k* ww(sd/g/n4t tz 7 9its velocity $v \mathrm{~m} \mathrm{~s}^{-1}$ is related to its displacement s 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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