自然数立方和的推导方法已有多种,本文将利用物理知识再给出一种推导方法. 设有一个物体从静止开始做加速度为a的匀加速直线运动,将它运动的时间分为n段,每段时间分别为1s,2s,…,ns.记该物体在第n段时间末的速度为vn,在第n段时间内的位移为sn,从静止到第n段时间末的位移为s,则 There are many ways to derive the natural number cube sum. This article will use physics knowledge to give a derivation method. There is an uniform acceleration linear motion with acceleration a from the beginning of an object, and the time of its motion is divided into n segments. Each time is 1s, 2s, ..., ns. The speed of the object at the end of the nth period is vn, the displacement in the nth period is sn, and the displacement from the rest to the end of the nth period is s, then