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.98mB.89mC.

时间:2024-04-30 08:51:27 5A范文网 浏览: 平时作业 我要投稿

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(  )5A<a href=https://www.5a.net/fanwendaquan/ target=_blank class=infotextkey>范文</a>网

A.

9
8
 m

B.

8
9
 m

C.

3
4
 m

D.

4
3
 m


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
,根据△x=aT2得:a=
△x
T2
=
1
T2
,则有:vA=vB-aT=
5
2T
-
1
T2
•T=
3
2T
,根据速度位移公式得,O、A两点之间的距离为:xOA=
vA2
2a
=
9
4T2
2
T2
=
9
8
m.故A正确,BCD错误.故选:A.

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