Question
Bahasa Melayu
Rajah 2 menunjukkan lintasan sebuah suar isyarat yang dilepaskan dari puncak sebatang tiang tegak, yang berdiri di atas tanah rata 2 m dari dinding OA sebuah gudang. Ketinggian, dalam m, suar itu dari aras tanah dimodelkan oleh $h(x) = -2x^2 + 24x - 25$, dengan keadaan $x$ ialah jarak mengufuk, dalam m, suar itu dari dinding OA, bagi $x \ge 2$. Suar itu meletup pada titik tertinggi lintasannya, dan serpihannya kemudian jatuh ke tanah, mencecah tanah apabila $h(x) = 0$.
Cari jarak garis lurus, dalam m, antara titik suar itu meletup dengan titik serpihan itu mencecah tanah.
Beri jawapan anda betul kepada dua tempat perpuluhan.
Cari jarak garis lurus, dalam m, antara titik suar itu meletup dengan titik serpihan itu mencecah tanah.
Beri jawapan anda betul kepada dua tempat perpuluhan.
English
Diagram 2 shows the path of a signal flare fired from the top of a vertical pole, which stands on level ground 2 m from the wall OA of a warehouse. The height, in m, of the flare above the ground is modelled by $h(x) = -2x^2 + 24x - 25$, where $x$ is the horizontal distance, in m, of the flare from the wall OA, for $x \ge 2$. The flare bursts at the highest point of its path, and the burnt shell then falls to the ground, reaching it where $h(x) = 0$.
Find the straight-line distance, in m, between the point where the flare bursts and the point where the shell reaches the ground.
Give your answer correct to two decimal places.
Find the straight-line distance, in m, between the point where the flare bursts and the point where the shell reaches the ground.
Give your answer correct to two decimal places.
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Modelled on Selangor trial · Kertas 2 · Q4(b)
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Modelled on Selangor trial · Kertas 2 · Q4(b)
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