A.12m/s,39m/s | B.8m/s,38m/s |
C.12m/s,19.5m/s | D.8m/s,13m/s |
A.刚离开发射塔升空的火箭 |
B.围绕地球做匀速圆周运动的神州八号飞船 |
C.定点在地球赤道上空的同步卫星 |
D.游乐场里从斜直滑梯上正在匀速下滑的小孩 |
A.24m | B.25m | C.26m | D.30m |
A.1m/s | B.0.5m/s | C.2m/s | D.2.5m/s |
A.匀加速直线运动; | B.匀减速直线运动; |
C.匀变速曲线运动; | D.变加速曲线运动。 |
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