试题与答案

下图是简化后的跳台,滑雪的雪道示意图。整个雪道由倾斜的助滑雪道AB和着陆雪道DE

题型:计算题

题目:

下图是简化后的跳台,滑雪的雪道示意图。整个雪道由倾斜的助滑雪道AB和着陆雪道DE,以及水平的起跳平台CD组成,AB与CD圆滑连接。运动员从助滑雪道AB上由静止开始,在重力作用下,滑到D点水平飞出,不计飞行中空气阻力,经2s在水平方面向飞行了60m,落在着陆雪道DE上。已知从B到点D点运动员的速度大小不变。(g取10m/s2)求

(1)运动员在AB段下滑到B点的速度大小;

(2)若不计阻力,运动员在AB段下滑过程中下降的高度;

(3)若运动员的质量为60kg,在AB段下降的实际高度是50m,此过程中他克服阻力所做的功。

答案:

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Greatly shocked by this   49 , I gave him all the money in the ashtray. He   50  with joy and tears in his eyes, “You just made it   51  for me to see my mom for Christmas! The bus offering this great sale is   52  right away!” It was a moment I’ll never forget. I think that man won’t forget it either, but I was the one who got the best __53__ in life – giving. It also   54  me that nothing is a coincidence,   55  everything has meaning.
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