how many is the apple 错在哪里

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• 1.一个做*落体运动的物体,在落地前的最后 1s 内的位移为 25m （g=10 m/s2) ,求（1）物体开始下落时离地面的高度（2）物体落地前最后2s 内的平均速度2.如果不假思索地把公式s=vt 和v=at 结合在一起,就会得出s=at2.这样错在哪里?3.作匀速直线运动的物体在连续两个2.5s的时间内通过的距离之比为 2：3,并且这5s内的平均速度为10m/s,求该物体的加速度以及5秒初、末的速度这些皆为书上的题目,不是自我创造
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