懂英文的進(jìn).
懂英文的進(jìn).
A light is at the top of a pole 80ft high.A ball is dropped at the same height from a point 20ft from the light.Assuming that the ball falls according to the law s=16t^2,how fast is the shadow of the ball moving along the ground one second later?
答案是200ft/sec.
A light is at the top of a pole 80ft high.A ball is dropped at the same height from a point 20ft from the light.Assuming that the ball falls according to the law s=16t^2,how fast is the shadow of the ball moving along the ground one second later?
答案是200ft/sec.
英語(yǔ)人氣:402 ℃時(shí)間:2020-02-03 22:00:55
優(yōu)質(zhì)解答
XXV2008 ,中文意思如下:燈在一個(gè)高80英尺的竿的頂端,一個(gè)在豎直位置與燈同高,水平方向距燈20英尺的點(diǎn)落下,假定燈以s=16t^2(s為距離,t為下落時(shí)間)的規(guī)律下落,請(qǐng)問(wèn),1秒后燈的影子沿地面移動(dòng)的速度是多少?樓主,你畫...
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