The following formulas are used to plot the position of the cannon ball in the applet on this page:

  x = x0 + V * cos(angle) * t
  y = y0 + V * sin(angle) *t - (1/2) * g * t^2

where:
  x0 = starting x coordinate
  y0 = starting y coordinate
  t = time
  V = initial velocity
  angle = firing angle
  g = gravitational effect

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