Why still no dive acceleration difference?

[Crumpp]

I have a question for you:
At 1st second, you begin to 45 degree dive,
At 2nd second, your speed increase a little, acceleration is greater than g.
at 3rd second, your speed increase a little more, and acceleration is still greater than g.

.....

at 20th second, you reach the equilibrium point, and acceleration is ZERO. Your speed remains same.
at 21st second, your speed is same as 20th second.
at 22nd second, hour speed is same as 20th second.
......

How about the 19th second? what's your acceleration? It should be smaller than g, but I need more accurate data.

Is the acceleration at 19th second nearly zero or around 0.5*g?

http://philsci-archive.pitt.edu/1197...y_Solution.pdf