A.甲先到达 | B.乙先到达 | C.同时到达 | D.不能判断 |
. |
v甲 |
v1
| ||||
t |
v1+v2 |
2 |
. |
v乙 |
x | ||||||||
|
2v1v2 |
v1+v2 |
. |
v乙 |
. |
v甲 |
2v1v2 |
v1+v2 |
v1+v2 |
2 |
-(v1-v2)2 |
2(v1+v2) |
. |
v甲 |
. |
v乙 |
x | ||
|
A.从开始起跑到t=2s时小明的位移约为17m |
B.图线与时间轴所包的“面积”约为100m |
C.其最大速度约为9.4m/s |
D.全程平均速度约为4.7m/s |
A.(
| B.1:(
| C.2:1 | D.1:2 |
A.12m/s,39m/s | B.18m/s,54m/s |
C.12m/s,19.5m/s | D.8m/s,13m/s |
t |
2 |
s |
2 |
A.两者速度相等 | ||||
B.若过程为匀加速运动,V
| ||||
C.若过程为匀减速运动,V
| ||||
D.条件不足,无法比较 |
A.v1=12m/s,v2=39m/s | B.v1=8m/s,v2=38m/s |
C.v1=12m/s,v2=19.5m/s | D.v1=8m/s,v2=13m/s |
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