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IB MAI HL Number and Algebra Topic 1.5 Matrices (id: 6ef9dbf00)

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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

[填空题]
When a ball is thrown xyx886p u: ut5:e3x:itakbjzfrom the top of a tal;r/n k(dva)y kl building, its height above the ground after t seconds is giaynk/ r)(vk; dven by s(t)=at$^2$+bt+c , where a,b,c∈R and s(t) is measured in metres. After 1 second, the ball is 84.3 m above the ground; after 2 seconds, 93.9 m; after 8 seconds, 42.3 m.

1.1Write 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 building.
s(t)=  m.
3.Find the time it takes for the ball to hit the ground.
t is(≈)    seconds.




参考答案:
空格1: 2.6空格2: 17.4空格3: 69.5空格4: 69.5空格5: 9.50±0.5


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