1 |
2 |
1 |
2 |
A.当物体作匀加速直线运动时,v1>v2 |
B.当物体作匀减速直线运动时,v1>v2 |
C.当物体作匀速直线运动时,v1=v2 |
D.当物体作匀减速直线运动时,v1<v2 |
v | 21 |
v | 20 |
s |
2 |
v | 22 |
v | 21 |
s |
2 |
|
1 |
2 |
t |
2 |
. |
v |
s |
t |
v0t+
| ||
t |
1 |
2 |
. |
v |
v0+v |
2 |
v0+v |
2 |
v | 21 |
v | 22 |
| ||||
2 |
v0+v |
2 |
(v0-v)2 |
4 |
1 |
2 |
A.s | B.2s | C.3s | D.4s |
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