00:01
In this video, we will be looking at how to find the coordinates of a particle on a given trajectory after it has moved 60 units.
00:15
Okay, so we have this trajectory.
00:18
We're starting at time equals 2, and we're going to time equals b, but we don't know b.
00:24
We are given that the arc length of the parameterized curve from 2 to b is 60 units.
00:32
And we're asked to find the r of b essentially.
00:39
We have to find where along the trajectory, where in three -dimensional space, and what the coordinates are of the particle.
00:47
So the way we're going to do this is we're going to use the equation for arc length in three dimensions with the given constraints, which looks as follows, and we're going to set it equal to 60.
01:26
And this integral actually, simplifies quite a bit.
01:32
What we can do is we can take out six, six squared.
01:40
And we get six times the integral from two to b of square root of two squared plus two squared t plus t squared equals 60...