00:01
So the first thing to do with this problem, 16t squared plus 64t and everything's in seconds, is they want you to find the average velocity on the interval from 1 to 2.
00:19
So the formula for that is going to be h of 2 minus h of 1 over 2 minus 1.
00:27
So what you have to do is plug in two and for all these t's.
00:32
And when i did that, i got 64.
00:34
And then plug in one in for both those t's.
00:37
And when i did that, i got 48.
00:41
And 64 minus 48 gives me 16.
00:45
And 16 divided by 1 is still 16.
00:50
So that answer is in feet per second.
00:54
But that should be your first answer.
00:56
So let me put a little a there.
00:58
So then when they ask you to do from t equals 1 to 1 plus h, i don't really like that they did h up here, then they did h down here, but that's okay.
01:10
I'm going to use a function notation again over 1 plus h minus 1.
01:16
I hope you notice in the denominator, those ones will cancel, and you're left with h...