A.若m1>m2,则x>L |
B.若m1=m2,则x=L |
C.若m1<m2,则x>L |
D.无论m1、m2的大小关系如何,都有x=0 |
车速(km/h) | 反应距离s(m) | 刹车距离 x (m) | 停车距离L(m) |
40 | 10 | 10 | 20 |
60 | 15 | 22.5 | 37.5 |
80 | A=( ) | B=( ) | C=( ) |
A.3 s内的位移是9 m; | B.3 s内的位移是12 m; |
C.3s末的速度是-6 m/s; | D.3 s末的速度是0m/s. |
A.1:2 | B.1:4 | C.1: | D.2:1 |
A.2 m/s; | B.10 m/s; | C.2.5 m/s; | D.5 m/s |
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