汽车以20m/s的速度匀速运动,刹车后加速度大小为5m/s2,那么刹车后2s

汽车以20m/s的速度匀速运动,刹车后加速度大小为5m/s2,那么刹车后2s内和刹车后5s内汽车的位移大小之比为

A.1:1             B. 4:5            C.3:4              D. l:3

 

答案

C

解析:略

 

相关题目

索科特拉岛曾经与非洲的索马里半岛相连,岛上有许多奇特
索科特拉岛曾经与非洲的索马里半岛相连,岛上有许多奇特的动植物。图9是索科特拉岛位置图。读图回答17~18题。 图9 17.某年7月,一艘油轮从该岛
下列过程是吸收热量的是 A.金属钠与水反应          
下列过程是吸收热量的是 A.金属钠与水反应                 B.碳酸钙高温分解 C.浓硫酸稀释                     D.氨气液化
Because he had no money left to buy tickets he had to work his p_______  to Au
Because he had no money left to buy tickets he had to work his p_______  to Australia.  
— Which is the car he drives? — It’s _________. A. cart fifty-four B. the
— Which is the car he drives? — It’s _________. A. cart fifty-four B. the fifty-four carC. fifty-four car D. the fifty-fourth car  
Some years ago, writing in my diary used to be a usual activity. I would return
Some years ago, writing in my diary used to be a usual activity. I would return from school and spend the expected half hour recording the day's events, feelings, and impressions in my little blue d
荡胸生层云,                 。(《望岳》)
荡胸生层云,                 。(《望岳》)
如图处于细胞分裂的某个时期,下列说法不正确的是( ) A
如图处于细胞分裂的某个时期,下列说法不正确的是( ) A.此图所示的细胞可能进行有丝分裂 B.此图所示的细胞可能进行减数第二次分裂 C.此图
维生素C又名抗坏血酸,易溶于水,易被氧化,遇热易被破坏
维生素C又名抗坏血酸,易溶于水,易被氧化,遇热易被破坏,人体缺乏维生素C可能引发多种疾病,它的化学式是C6H8O6。计算: (1)维生素C的相对分子

最新题目