<meta charset="UTF-8" />
<script src="http://spelprogrammering.nu/simple.js">
function start()
{
  arrow(10, 400, 45, 550, false, 2, "red");
  arrow(10, 400, 0, 550*cos(pi/4), true, 2, "green");
  arrow(10, 400, 90, 550*cos(pi/4), true, 2, "green");
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  text(60, 380, 25, "α", "black");
  text(150, 380, 25, "v0x = 100*cos(α)", "green");
  text(20, 30, 25, "v0y = 100*sin(α)", "green");
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  rotate(-45);
  text(0, 0, 25, "v0 = 100 m/s", "black");
}
</script>