U0 |
d |
q |
m |
dg |
U0 |
1 |
2 |
1 |
2 |
U0+△U1 |
d |
△U1 |
d |
U0+△U1-△U2 |
d |
△U2-△U1 |
d |
△U1 |
△U2-△U1 |
1 |
3 |
△U1 |
△U2 |
1 |
4 |
A.va=2 m/s,vb=3 m/s,vc=4 m/s |
B.va=2 m/s,vb=4 m/s,vc=6 m/s |
C.va=3 m/s,vb=4 m/s,vc=5 m/s |
D.va=3 m/s,vb=5 m/s,vc=7 m/s |
A.车速越大,它的惯性越大 |
B.质量越大,惯性就越大 |
C.质量越大,滑行距离越短 |
D.滑行距离越长,说明初速度越大 |
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