自由下落的物体第n秒内通过的位移比第(n－1)秒内通过的位移多多少(

自由下落的物体第n秒内通过的位移比第(n－1)秒内通过的位移多多少(g取10 m/s2)( 　).

A．10 m B．5(2n＋1) m C．3(n＋1) m D m

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