1 |
2 |
v | 20 |
L |
v0 |
1 |
2 |
1 |
2 |
eU′ |
d1m |
2
| ||
L2 |
2
| ||
Bd2L2 |
2
| ||
Bd2L2 |
2
| ||
Bd2L2 |
A.①③④ | B.②③④ | C.①②③ | D.①②④ |
A.小球的机械能减少(mg+Ff)H |
B.小球的动能减少mgH |
C.小球的动能减少FfH |
D.小球的机械能减少FfH |
A.一物体的动量不变,其动能一定不变 |
B.一物体的动能不变,其动量一定不变 |
C.两物体的动量相等,其动能一定相等 |
D.两物体的动能相等,其动量一定相等 |
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