某物体从足够高处开始做自由落体运动，则下列说法中正确的是（取

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某物体从足够高处开始做自由落体运动，则下列说法中正确的是（取g=10m/s²）（）

A．第2s内的平均速度为20m/s

B．任意1s的末速度总比其初速度大5 m/s

C．第5s内的位移为45m

D．后1s的位移总比前1s的位移多5m

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