U |
d |
2qUl |
d |
. |
| . |
2qUl |
d |
2qUl |
d |
1 |
2 |
1 |
2 |
2qUl |
d |
qU |
d |
v2 |
l |
10mg |
3 |
11qU |
3d |
2qUl |
d |
2qUl |
d |
10mg |
3 |
11qU |
3d |
A.m1<m2,g1<g2 | B.m1<m2,g1>g2 |
C.m1>m2,g1>g2 | D.m1<m2,g1=g2 |
3 |
4 |
A.物体的动能增加
| ||
B.物体的重力做功mgh | ||
C.物体的机械能损失了
| ||
D.物体所受摩擦力做功
|
A.0.5m/s2 | B.1m/s2 | C.1.5m/s2 | D.2m/s2 |
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