A.位移是0.8m | B.位移是-0.8m |
C.运动时间是0.2s | D.落地速度是-4m/s |
1 |
2 |
A.2m,-2m,-1m | B.-2m,2m,1m | C.4m,0,1m | D.-4m,0,-1m |
A.3πR 2R | B.2R 3πR | C.R 3.5πR | D.3.5πR R |
A.位移为9m | B.路程为9m | C.位移为1m | D.位移为-1m |
A.25m,15m | B.25m,-15m | C.25m,-5m | D.35m,5m |
A.2πR,2πR | B.2πR,0 | C.0,2πR | D.0,0 |
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