v |
2 |
v0 |
2 |
v | 20 |
| ||
2g |
E
| ||
2g |
E
| ||
2g |
A.s1:s2=4:1 | B.s1:s2=1:1 | C.s1:s2=2:1 | D.s1:s2=1:2 |
A.W=
| ||||
B.W=0 I=mv Q=2mv2 | ||||
C.W=2mv2 I=2mv Q=2mv2 | ||||
D.W=2mv2 I=0 Q=0 |
A.16J、16J | B.8J、24J | C.32J、0J | D.48J、-16J |
A.1J | B.5J | C.7J | D.无法计算 |
A.Ek2=Ek1 | B.Ek2=2Ek1 |
C.Ek2>2Ek1 | D.Ek1<Ek2<2Ek1 |
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