A.甲、乙两物体的间距将随时间成正比增大 |
B.甲、乙两物体的运动速度之差随时间成正比增大 |
C.甲、乙两物体的运动速度之差恒定不变 |
D.以甲为参照物,乙做匀速直线运动 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
4 |
A.2s | B.
| C.(
| D.1s |
A.h/2 | B.h/4 | C.3h/4 | D.3h/8 |
A.t<t′ | B.t=t′ | C.t>t′ | D.无法判断 |
A.30m/s | B.40m/s | C.50m/s | D.60m/s |
A.5m | B.10m | C.15m | D.40m |
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