A.1:1 | B.1:2 | C.1:3 | D.1:4 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
W1 |
W2 |
1 |
3 |
A.
| B.
| C.
| D.
|
A.E2=E1 | B.E2=2E1 | C.E2>2E1 | D.E1<E2<2E1 |
A.eU | B.eU+
| C.
| D.
|
A.W+mgh2-mgh1 | B.W+mgh1-mgh2 |
C.mgh1-mgh2-W | D.mgh2-mgh1-W |
A.质量大的滑行距离大 |
B.质量小的滑行距离大 |
C.质量小的滑行时间短 |
D.它们克服摩擦力所做的功不一样大 |
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