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This is simple, and it does not need calculus.
Simply plug in the time period over which you want to know the average velocity into the distance equation, and then divide that answer by the time duration.
I.e for t=.5 then y=40*.5-16*.5^2=16.
then divide that answer by the time to get average velocity: avgV=y(t)/t=16/.5=32
Don't overthing the problems.
The average velocity will determine the position of the ball at time t, so take the position and divide it by that time.
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