问题
选择题
在我校秋季运动会100m比赛中，测得某运动员7s末的速度为9m/s，12.5s末冲过终点时的速度为10.2m/s，该运动员在全程的平均速度为（ ）
A．8m/s
B．9m/s
C．10m/s
D．10.2m/s
答案
全程的平均速度
=. v
=x t
m/s=8m/s．故A正确，B、C、D错误．100 12.5
故选A．
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在我校秋季运动会100m比赛中，测得某运动员7s末的速度为9m/s，12.5s末冲过终点时的速度为10.2m/s，该运动员在全程的平均速度为（ ）
A．8m/s
B．9m/s
C．10m/s
D．10.2m/s
全程的平均速度
=. v
=x t
m/s=8m/s．故A正确，B、C、D错误．100 12.5
故选A．
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