翻譯如下:
一個(gè)球員以20m/s的速度拋出了一只足球,球離開他手時(shí)離地1.8m,接著,球在同一高度下被30米外的另一個(gè)球員接住了
請問,球的運(yùn)動(dòng)軌跡上可能的最大高度為多少?
要設(shè)角度來做的,設(shè)拋出時(shí)速度方向和水平夾角為A
所以球的水平速度是20cosA,豎直速度是20sinA,方向向上
所以球運(yùn)動(dòng)的時(shí)間就是t=s/v=30/20cosA
所以豎直速度就要滿足20sinA/g=0.5*30/20cosA
算出角度A為0.5arcsin0.75,得出水平速度,豎直速度,運(yùn)動(dòng)時(shí)間
所以最大高度就為0.5*豎直速度*運(yùn)動(dòng)時(shí)間=3.386m
一道英語物理題
一道英語物理題
A quarterback passes the football downfield at 20m/s .It leaves his hand 1.8m above the ground and is caught by a receiver 30m away at the same height
What is the maximum height of the ball on its way to the receiver?
A quarterback passes the football downfield at 20m/s .It leaves his hand 1.8m above the ground and is caught by a receiver 30m away at the same height
What is the maximum height of the ball on its way to the receiver?
英語人氣:384 ℃時(shí)間:2020-02-04 02:12:30
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