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IB MAI HL Number and Algebra Topic 1.5 Matrices (id: b006237ff)

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admin 发表于 2024-2-6 05:06:48 | 显示全部楼层 |阅读模式
本题目来源于试卷: IB MAI HL Number and Algebra Topic 1.5 Matrices,类别为 IB数学

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When a coin is thrown from the top of a skyscraper, its he lso9 dl4fz( s9tnzc).ight above the groumx dj:,rl*d m q/sjxg95,c:xpnd after t 5* j:xxj/q, sldd gcmx9mp:,r seconds is given by s(t)=at$^2$+bt+c , where a,b,c∈R and s(t) is measured in metres. After 1 second, the coin is 179.3 m above the ground; after 2 seconds, 188.2 m; after 6 seconds, 159.8 m.

1.1.Write down a system of three linear equations in terms of a, b and c.

1.2.Hence find the values of a, b and c.
Hence we find a=−  ,b=  ,c=  

2.Find the height of the skyscraper.
s(t)=  m.
3.Find the time it takes for the coin to hit the ground.
t is(≈)    seconds.




参考答案:
空格1: 3.2空格2: 18.5空格3: 164空格4: 164空格5: 10.6±0.1


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