问题描述:
如图所示,物体从O点由静止开始做匀加速直线运动,途经A、B、C三点,其中|AB|=2m,|BC|=3m.若物体通过AB和BC这两段位移的时间相等,则O、A两点之间的距离等于( )A.
9 |
8 |
B.
8 |
9 |
C.
3 |
4 |
D.
4 |
3 |
最佳答案:
设物体通过AB、BC所用时间分别为T,则B点的速度为:vB=
xAC |
2T |
5 |
2T |
△x |
T2 |
1 |
T2 |
5 |
2T |
1 |
T2 |
3 |
2T |
vA2 |
2a |
| ||
|
9 |
8 |
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