该程序模拟了降落伞的下降过程，其结果对于类似问题有借鉴作用。-The program simulates a parachute drop in the process, the results serve as a reference for similar problems.

Skydiving Simulation. Simulation can help predict position and velocity of a skydiver who jumps an airplane and opens a parachute. In this tutorial, we predict the position and velocity of a skydiver in two dimensions (horizontal and vertical) the ti