A.0~10ms B.20~30ms C.10~20ms D.30~40ms E.40~50ms
A.0.5m/s B.1.5m/s C.2.4m/s D.4m/s E.3m/s
A.1~2㎝ B.2~3㎝ C.3~4㎝ D.5~6㎝ E.7~8㎝