00:01
So for part a, our goal is to figure out what the initial velocity is of the flea.
00:06
We know that the distance traveled is 0 .440 meters.
00:10
The acceleration is negative 9 .8 meters per second squared.
00:13
And the final velocity is 0 because the flea reaches the top of his jump and his velocity is 0 at that point.
00:20
The kinematic equation that we're going to use is v squared is equal to v0 squared plus 2 acceleration x minus x -knot.
00:30
I'm using this kinematic equation because it doesn't involve t whereas the other three do and so they won't yield the correct answer because you'll have two unknowns in them but in this one we just have one unknown and it's our v not so v is zero so v squared is also zero b knots are unknown and then a is negative 9 .8 so plugging that in here and substituting in 0 .440 here we're able to get that it's v0 squared minus 8 .624.
01:09
Sorry about that.
01:11
And then now we can solve for b0.
01:13
B0 is equal to 2 .94 by moving this over and then taking the square root of it.
01:20
And that's in meters per second.
01:26
Now part b.
01:28
Part b asked for the time that the flea is in the air.
01:32
And so what we do is we're going to use this kind of mac equation...