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在 \vec a = (0, -g) 、 \vec v_0 = (v_0 costheta, v_0 sintheta) 下的抛体轨迹。
在 \vec a = (0, -g) 、 \vec v_0 = (v_0 costheta, v_0 sintheta) 下的抛体轨迹。
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