from mathimport pi, sin, cos, radiansfrom turtleimport Turtledef main():  angle = eval(input('Enter the launch angle(in degrees):'))vel = eval(input('Enter the initial velocity(in meters/sec):'))h0 = eval(input('Enter the initial height(in meters):'))time = eval(input('Enter the time interval:'))# 設置鉛球的起始位置xpos = 0ypos = h0theta = radians(angle)# 將輸入的角度值轉換為弧度值xvel = vel * cos(theta)# 鉛球的初始速度在x軸上的分量yvel = vel * sin(theta)# 鉛球的初始速度在y軸上的分量# 創建Turtle對象， 剛創建的小烏龜對象， 位于坐標原點（ 0, 0）， 朝向x軸正方向t = Turtle()t.color('red')# 設置畫筆的顏色t.pensize(2)# 線條粗細t.speed(2)# 調整速度t.hideturtle()# 隱藏小烏龜# 繪制x軸和y軸t.forward(350)# 繪制x軸t.goto(0, 0)# 回到坐標原點， 準備繪制y軸t.goto(0, 200)# 繪制y軸print('the position:({0:.3f},{1:0.3f})'.format(xpos, ypos))xScale = 25# x坐標放大倍數yScale = 30# y坐標放大倍數# 畫筆移到鉛球的起始位置， 準備繪制鉛球的運行軌跡t.goto(xpos * xScale, ypos * yScale)# 通過while循環繪制鉛球的運行軌跡， 每隔time秒， 取一個點， 將所有取到的點連起來while ypos >= 0:  xpos = xpos + time * xvelyvel1 = yvel - time * 9.8ypos = ypos + time * (yvel + yvel1) / 2.0yvel = yvel1print('the position:({0:.3f},{1:0.3f})'.format(xpos, ypos))t.goto(xpos * xScale, ypos * yScale)print('/nDistance traveled:{0:0.1f} meters.'.format(xpos))if __name__ == '__main__':  main()