A.0;0 | B.2r,向东; | C.r,向东; | D.2r,向东;2r |
A.110 km/h是平均速度,100 km是位移 |
B.110 km/h是平均速度,100 km是路程 |
C.110 km/h是瞬时速度,100 km是位移 |
D.110 km/h是瞬时速度,100 km是路程 |
A.a =" 8" m/s2;x =" 4" m | B.a =" 8" m/s2;x =" 8" m |
C.a =" 2" m/s2;x =" 4" m | D.a =" 2" m/s2;x =" 8" m |
A.2.5m,2.5m | B.2.5m,0.5m |
C.1.5m,1m | D.1.5m,0. |
A.路程和位移都是70m |
B.路程和位移都是50m |
C.路程为70m,位移为50m |
D.路程为50m,位移为70m |
A.平均速度为瞬时速度的算术平均值 |
B.火车以速度v经过某一段路,v是指瞬时速度 |
C.物体通过的路程不同,但位移可能相同 |
D.位移的数值一定比路程小 |
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