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利用积分法求解出以第一宇宙速度竖直向上发射的抛射体在空中飞行时间的准确值,并分析化“直线”为“椭圆”的解题方法,指出求出飞行时间“近似值”等于其“准确值”的原因。
The integral method is used to solve the accurate value of the projectile flying vertically upward from the first cosmic velocity in the air and the method of solving the problem that the straight line is the elliptic is analyzed. The reason that “approximation” equals its “exact value”.