您所在的当前位置：高中物理试题 >

匀变速直线运动

> 某一时刻a、b两物体以不同的速度经过某一点，并沿同一方向做匀加速直线运动，已知两物体的加速度相同，则在运动过程中(　　) A．a、b两物体速度之差保持不变 B．a、b两物体速度之差与时间成正比 C．a、b两物体位移之差与时间成正比 D．a、b两物体位移之差与时间平方成正比

问题：

发布时间：2024-09-13

某一时刻a、b两物体以不同的速度经过某一点，并沿同一方向做匀加速直线运动，已知两物体的加速度相同，则在运动过程中(　　)

A．a、b两物体速度之差保持不变

B．a、b两物体速度之差与时间成正比

C．a、b两物体位移之差与时间成正比

D．a、b两物体位移之差与时间平方成正比

参考答案：

提问用户：NH***O80

可能感兴趣的题目：

1 已知函数 f(x)=( 3 sinωx+cosωx)cosωx- 1 2 ，（ω＞0）的最小正周期为4π．（1）若函数y=g（x）与y=f（x）的图象关于直线x=π对称，求y=g（x）的单调递增区间．（2）在△ABC中角A，B，C，的对边分别是a，b，c满足（2a-c）cosB=b•cosC，求函数f（A）的取值范围．
2 新疆的葡萄干是在“晾房”中制成的，它所利用的气候条件是 A.风大 B.温度带 C.温差大 D.气候干燥
3 甲、乙两电炉并联在同一电源上，各有开关控制，甲炉电阻是乙炉的4倍，要两电炉产生同样多的热量则应 A.甲通电时间是乙的4倍 B.乙通电时间是甲的4倍 C.甲、乙通电时间一样长 D.不知道额定电压无法比较
4 2013年，将建成基于北斗卫星导航系统的地质灾害检测预警系统，对北京市地质灾害点实现全覆盖。北斗卫星导航系统应用于北京市泥石流灾害的预警，是因其能 A．实时发布灾情信息，有利于救灾减灾 B．及时发现地面变动，并传输位置信息 C．分析灾害的成因，提出相应解决措施 D．根据灾害特点，模拟灾害发生的过程
5 完形填空. Laughter and tears are parts of living. But do you find enough time for laughter? I am not asking if you 1 lots of good times. 2 we should laugh during the happy times. But do you also laugh during the 3 times? Erma Bombeck 4 her humorous books, but she wrote one that 5 a more serious topic: cancerin children. Erma talks with many children with cancer and learns 6 life lessons from them. She learns,for instance, that cancer survivors know 7 to laugh. She 8 the experience of 15-year-old Jessica from Burlington. Jessica"s leg was cut off at the knee because of cancer. She was learning to 9 a prosthesis (假肢). Jessica tells about playing 10 . She kicked the ball 11 and it flew of f in one 12 while her artificial leg flew another way. She fell on the 13 and laughed. Jessica may not have laughed about her cancer, but she laughed about handling the 14 of it. And her laughter helped her deal. There is the story of 17-year-old Betsy. She 15 her way to the radiation room for her regular radiation therapy. As 16 , she dropped her hospital gown and, wore only her birthday suit, 17 onto the table and waited. The extra people in the room were not the medical students she had thought, but 18 painters giving an estimate on painting! Betsy laughs heartily about the incident. And like Jessica, her 19 to laugh helped her to deal with one of the most difficult things a young person can endure- cancer. Do you find plenty of 20 for laughter? You can ... if you also find reasons to laugh during the especially difficult times. Survivors know how to laugh. If you can laugh even when the going is rough, you"ll make it. And you"ll smile at the end. ( )1. A. lose ( )2. A. Of course ( )3. A. sad ( )4. A. is famous as ( )5. A. connected ( )6. A. serious ( )7. A. when ( )8. A. describes ( )9. A. put ( )10. A. basketball ( )11. A. gently ( )12. A. way ( )13. A. ground ( )14. A. cause ( )15. A. tried ( )16. A. common ( )17. A. climbed ( )18. A. also ( )19. A. strength ( )20. A. times B. miss B. In addition B. difficult B. was famous as B. reported B. important B. why B. learns B. have B. badminton B. hard B. method B. table B. result B. took B. often B. lay B. rather B. courage B. places C. experience C. At first C. pleasant C. is known for C. called C. careful C. how C. keeps C. wear C. volleyball C. slightly C. direction C. chair C. process C. made C. be fore C. jumped C. already C. ability C. days D. enjoy D. First of all D. usual D. was known for D. covered D. thoughtful D. what D. imagines D. make D. soccer D. straightly D. point D. bed D. end D. carried D. usual D. sat D. almost D. confidence D. moments
6 不定项选择放在水平地面上的物体质量为m，用一水平恒力F推物体，持续作用t秒，物体始终处于静止状态，那么在这段时间内（） A．F对物体的冲量为零 B．重力对物体的冲量为零 C．合力对物体的冲量为零 D．摩擦力对物体的冲量为零
7 已知 =（3，4）， =（5，12），与则夹角的余弦为（） A． B． C． D．
8 ____ over whenever we want to make a decision, many people believe, and we will have less chance of making mistakes. [ ] A. To think B. Think C. Thinking D. Thought
9 我国香港、澳门、台湾在经济上的共同特点是 A.都以博彩业为主 B.都以出口加工业为主 C.都以钢铁、机械等重工业为主 D.都以农业和农产品加工业为主
10 The car accident on the main road the other day ____ the careless driving of a driver. A．was resulted from B．resulted in C．led to D．was resulted from