您所在的当前位置：高中物理试题 >

匀变速直线运动

> （14分）甲、乙两车相距40.5m，同时沿平直公路做直线运动，甲车在前，以初速度v 1=16m/s，加速度a 1=2m/s 2作匀减速直线运动，乙车在后，以初速度v 2=4.0m/s，加速度a 2=1.0m/s 2与甲同向作匀加速直线运动，求：（1）甲、乙两车相遇前相距的最大距离（2）乙车追上甲车经历的时间

问题：

发布时间：2024-09-09

（14分）甲、乙两车相距40.5m，同时沿平直公路做直线运动，甲车在前，以初速度v ₁=16m/s，加速度a ₁=2m/s ²作匀减速直线运动，乙车在后，以初速度v ₂=4.0m/s，加速度a ₂=1.0m/s ²与甲同向作匀加速直线运动，求：
（1）甲、乙两车相遇前相距的最大距离
（2）乙车追上甲车经历的时间

参考答案：

提问用户：p6***lP9

可能感兴趣的题目：

1 过的焦点的直线交抛物线与两点，求
2 设函数 f(x)=3sin(2x- 3 4 π)，（1）求y=f（x）的振幅，周期和初相；（2）求y=f（x）的最大值并求出此时x值组成的集合．（3）求y=f（x）的单调减区间．
3 汽车在长500km这段路程内的平均速度是40km/h，这意味着 A.汽车每小时走的路程是40km B.汽车跑完1000km需要25h C.汽车在这段路程的前半段的平均速度不可能达到60km/h D.汽车跑完这段路程需要12.5h
4 阅读理解。 "Soon, you"re going to have to move out!" cried my neighbor upon seeing the largest tomato plant known to mankind, or at least known in my neighborhood. One tiny 9-inch plant, bought for $1.25 in the spring, has already taken over much of my rose bed, covering much of other plants, and is well on its way to the front door. Roses require a good deal of care, and if it weren"t for the pleasure they give, it wouldn"t be worth the work. As it is, I have a garden full of sweet-smelling roses for most of the year. Bushes must be pruned(剪枝) in early spring, leaving ugly woody branches until the new growth appears a few weeks later. It was the space available in the garden that led me into planting just one little tomato plant. A big mistake. Soil conditions made just perfect for roses turn out to be even more perfect for tomatoes. The daily watering coupled with full sun and regular fertilizing have turned the little plant into a tall bush. The cage I placed around it as the plant grew has long disappeared under the thick leaves. Now the task I face in harvesting the fruit is twofold: First, I have to stand on my head, and once found I have to reach down and under, pick the tomatoes and withdraw (缩回) my full fist without dropping the prize so dearly won. I found tow full-blown white roses completely hidden as I picked tomatoes in June. But they were weak and the leaves already turned yellow for lack of light. Here I am faced with a painful small decision. To tear up a wonderful and productive tomato plant that offers up between ten and twenty ripe sweet tomatoes each day or say goodbye to several expensive and treasured roses. Like Scarlet in Gone with the Wind, I"ll think about that tomorrow. 1. The writer decided to plant the tomato just because ____. A. it cost little B. the soil conditions were proper C. the space left could be used D. the roses were growing too fast 2. What are the requirements for the healthy growth of rose? A. Enough care and right soil conditions. B. Frequent pruning and fertilizing. C. Tomato plants grown alongside. D. Cage placed around the roots. 3. By saying "the prize so dearly won" in Para.5, the writer wants to ____. A. show the difficulty in picking the tomatoes B. show the hardship of growing the roses C. express her liking for the roses. D. express her care for the tomatoes
5 在下列溶液中，各组离子一定能够大量共存的是（　　） A．含有较多Fe3+的溶液：NH4+、K+、SCN-、AlO2- B．水电离的c（H+）=1×10-12mol/L的溶液：Na+、Al3+、Br-、ClO- C．呈中性的无色溶液：Cu2+、Al3+、NO3-、Cl- D．pH=2的溶液：Fe3+、Cu2+、SO42-、NO3-
6 甲、乙两车做匀速直线运动速度之比是4：3，经过相同时间两车运动路程之比为 A.4：3 B.3：4 C.1：1 D.无法确定
7 What color is your clock? ________. A.White color. B.White. C.The white D.A white.
8 若，则与的夹角的取值范围是（）． A． B． C． D．
9 读“世界主要农业地域类型分布示意图”回答下列问题。（1）写出农业区中数字代表的世界农业地域类型:①____________②_____________③_____________④______________⑤________________ （2）①②两种农业地域类型的农场一般多为_____________经营的，种植作物中均有 ___________。（3）请分析图中④地区发展这种农业地域类型的社会经济的优势条件。（4）③地区牧牛业的发展对我国内蒙古呼伦贝尔草原发展畜牧业有何启示?
10 物体的动量变化越大,则( ) A．物体所受的合外力越大草原 B．物体的动量越大 C．物体所受合外力的作用时间越长 D．物体所受合外力的的冲量越大