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116问答网 > 某同学从象达去甘寨，前一半路程的平均速度是2m⼀s，后一半路程的平均速度是3m⼀s．则整个过程中的平均速度

某同学从象达去甘寨，前一半路程的平均速度是2m⼀s，后一半路程的平均速度是3m⼀s．则整个过程中的平均速度

2025-04-06 19:04:27

推荐回答（1个）

回答1：

设总路程为s，则前、后一半路程均为

1

2

s，
前一半路程用的时间：
t₁ =

1

2

s

v 1

=

s

2 v 1

=

s

2×2m/s

=

s

4m/s

，
后一半路程所用的时间：
t₂ =

1

2

s

v 2

=

s

2 v 2

=

s

2×3m/s

=

s

6m/s

，
物体全程时间t=t₁ +t₂ ，
全程平均速度：
v=

s

t

=

s

s

4m/s

+

s

6m/s

=2.4m/s．
故选答案为2.4．

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