2mg |
k |
1 |
2 |
v | 20 |
2gL |
1 |
2 |
2gL |
1 |
2 |
v | 20 |
1 |
2 |
v | 21 |
1 |
2 |
kL |
8m |
mg |
k |
kL |
4 |
1 |
2 |
KL |
8m |
KL |
4 |
A.烧断细绳的瞬间,小球的加速度a=
| ||
B.烧断细绳的瞬间,小球的加速度a=gsinθ | ||
C.弹簧在C处与小球断开的瞬间,小球的加速度a=
| ||
D.弹簧在C处与小球断开的瞬间,小球的加速度a=gsinθ |
A.480m,11250N | B.960m,22500N |
C.480m,22500N | D.960m,11250N |
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