A.1:
| B.1:
| C.1:
| D.1:4 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
s1 |
s2 |
| ||
|
s12 |
s22 |
25+x2 |
225+x2 |
s1 |
s2 |
1 |
3 |
s1 |
s2 |
1 |
1 |
1 |
3 |
s1 |
s2 |
A.1s | B.2s | C.3s | D.4s |
A.A点的速度方向沿切线向下,合力方向竖直向上 |
B.A点的速度方向沿切线向上,合力方向竖直向下 |
C.B点的速度方向沿切线向上,合力方向竖直向下 |
D.B点的速度方向沿切线向下,合力方向竖直向上 |
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