A girl at the bottom of a 100m high cliff throws a tennis ball vertically upwards.A boy at the very top of the cliff drops a golf ball so that it hits the tennis ball while both ball are still in the air.Q1:With what speed is the tennis ball thrown s

来源：学生作业帮助网 编辑：六六作业网 时间：2024/12/25 01:23:32
Agirlatthebottomofa100mhighcliffthrowsatennisballverticallyupwards.Aboyattheverytopofthecliffdropsag

A girl at the bottom of a 100m high cliff throws a tennis ball vertically upwards.A boy at the very top of the cliff drops a golf ball so that it hits the tennis ball while both ball are still in the air.Q1:With what speed is the tennis ball thrown s
A girl at the bottom of a 100m high cliff throws a tennis ball vertically upwards.A boy at the very top of the cliff drops a golf ball so that it hits the tennis ball while both ball are still in the air.
Q1:With what speed is the tennis ball thrown so that the golf ball strikes it at the top of its path?
Q2:What's the position of the tennis ball when the golf ball strikes it?

A girl at the bottom of a 100m high cliff throws a tennis ball vertically upwards.A boy at the very top of the cliff drops a golf ball so that it hits the tennis ball while both ball are still in the air.Q1:With what speed is the tennis ball thrown s
题目大意是：一个女孩在高为100米的高崖底部处垂直向上投出一个网球,一个小男孩在最顶端垂直向下释放一个高尔夫球,使两球能在空中相遇.
问题1:网球扔出时具有什么速度能使两球在网球到达最高处时相遇?
问题2:当两球相遇时,网球的位置?
(1) 设：网球掷出时的速度为v0,两球相遇时距离球抛出时间为t0
因为高尔夫球自由落体：所以加速度为g=9.8m/s(如果用10m/s的话也行,具体看题目要 求,没有要求的话两个都行,在这个题目中g对第一问无影响),网球只受地心引力作用所以加速度也为g=9.8m/s
由牛顿运动定理得：
相遇时：
网球：路程s1=v0t-1/2*gt*t（t

大意是：一女的在100米悬崖下向上垂直扔一网球，一男的再悬崖上放一高尔夫球，两球会在空中相撞。1.问网球的初速度是多少才能保证网球在其轨迹最高点与高尔夫球相撞？2.两球相撞的位置
1.网球s1=vt-1/2gt^2，高尔夫球s2=1/2gt^2，s1+s2=vt=100
网球轨迹最高点是速度为0，v-gt=0
g=10m/s^2, 由上两式可得初速度为v=根号100...

全部展开

大意是：一女的在100米悬崖下向上垂直扔一网球，一男的再悬崖上放一高尔夫球，两球会在空中相撞。1.问网球的初速度是多少才能保证网球在其轨迹最高点与高尔夫球相撞？2.两球相撞的位置
1.网球s1=vt-1/2gt^2，高尔夫球s2=1/2gt^2，s1+s2=vt=100
网球轨迹最高点是速度为0，v-gt=0
g=10m/s^2, 由上两式可得初速度为v=根号1000=10根号10m/s
2.代入v得s1=50m，相撞位置离地面50米

收起

at the bottom of,bottom的用法 at the bottom of 造句, on the bottom of和at the bottom of/in the bottom of区别 on the bottom of at the bottom of in the bottom of有什么区别 You at the bottom of my heart. 翻译The Fountain of Youth at the Bottom of a Wine Bottle looking at the world from the bottom of a well 歌词 I went on a boat with a glass bottom looking at the amazing fish. A girl at the bottom of a 100m high cliff throws a tennis ball vertically upwards.A boy at the very top of the cliff drops a golf ball so that it hits the tennis ball while both ball are still in the air.Q1:With what speed is the tennis ball thrown s A girl at the bottom of a 100m high cliff throws a tennis ball vertically upwards.A boy at the very top of the cliff drops a golf ball so that it hits the tennis ball while both ball are still in the air.Q1:With what speed is the tennis ball thrown s Please help translate He who would climb a ladder must begin at the bottom,thank you! 请问,有“on the bottom of”这个表达 at the bottom of是肯定有的.但有“on the bottom THE SWEETNESS AT THE BOTTOM OF THE PIE怎么样 在底部是at the bottom of 还是on the bottom of Try to sign your name _________ the letter.选项A.at the end ofB.at the bottom ofC.on the end ofD.on the bottom of请问大师选哪个,并说一下理由. At the bottom of my heart I feel a parental love that will never fade with the passing time. 1.The beautiful village l___ at the bottom of a mountain.2.It is not polite to s___at others. 专业英语翻译:The ambient temperatures measured from a thermocouple at 25.4 mm below the bottom of t