1 |
2 |
v | 21 |
1 |
2 |
v | 20 |
1 |
2 |
|
1 |
2 |
v | 21 |
1 |
2 |
1 |
4 |
v | 20 |
1 |
2 |
n(n+1) |
2 |
n(n+1) |
2 |
1 |
2 |
v | 20 |
1 |
2 |
v | 20 |
n(n+1) |
2 |
1 |
2 |
|
1 |
4 |
v | 20 |
1 |
2 |
1 |
2 |
v | 20 |
n(n+1) |
2 |
1 |
2 |
v | 2o |
0.72gH |
A.货物的重力势能一定增加mah |
B.货物的动能一定增加mah-mgh |
C.货物的机械能一定增加mah+mgh |
D.货物的机械能一定增加mah |
v0 |
4 |
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