Projectile Motion
Core Sentence / 核心句
Without air resistance, horizontal motion has zero acceleration while vertical motion has constant gravitational acceleration; both components share the same time.
中文理解：二维抛体不是一个新公式包，而是一维水平匀速与一维竖直匀加速的同步组合。
Component Model / 分量模型
Standard Workflow / 稳定流程
choose axes -> resolve -> solve with one time -> recombine components。
Watch Out / 易错点
与对称飞行时间只适用于同高起落。最高点只有 。