QE |
m |
2aL |
|
|
vA1-0 |
a |
|
1 |
2 |
|
|
|
|
1 |
2 |
|
|
1 |
2 |
1 |
2 |
mg |
QvA |
QE |
m |
mg |
Qat |
m2g |
Q2Et |
|
m2g | ||||
Q2E(t-
|
m2g | ||||
Q2E(t-2
|
|
|
m2g | ||||
Q2E(t-3
|
|
|
m2g | ||||
Q2E(t-n
|
|
|
|
m2g | ||||
Q2E(t-n
|
|
|
A.
| B.
| C.
| D.无法确定 |
m |
2 |
E0 |
2 |
A.甲在B点的动能一定大于乙在B′点的动能 |
B.甲滑行的总路程一定大于乙滑行的总路程 |
C.甲在B点的动量一定大于乙在B′点的动量 |
D.甲全部滑行的水平位移一定大于乙全部滑行位移 |
© 2017-2019 超级试练试题库,All Rights Reserved.