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> 物体以初速度竖直上抛，经3s到达最高点，空气阻力不计，g取10m/s 2，则下列说法正确的是 A．物体的初速度为60m/s B．物体上升的最大高度为45m C．物体在第1s内、第2s内、第3s内的平均速度之比为5∶3∶1 D．物体在1s内、2s内、3s内的平均速度之比为9∶4∶1

问题：

发布时间：2024-09-07

物体以初速度竖直上抛，经3s到达最高点，空气阻力不计，g取10m/s ²，则下列说法正确的是

A．物体的初速度为60m/s

B．物体上升的最大高度为45m

C．物体在第1s内、第2s内、第3s内的平均速度之比为5∶3∶1

D．物体在1s内、2s内、3s内的平均速度之比为9∶4∶1

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