00:01
For this problem, you're asked to work with the position function and find the instantaneous velocity at given situations.
00:12
All right, so the first thing we need to do is find the instantaneous velocity, which is the derivative of the position.
00:22
So we'll use the power rule, and that'll be negative 32t plus 96.
00:31
Then you're asked to find the initial or the instantaneous velocity at t equals 1.
00:48
So that's going to be negative 32 plus 96 and that will give you 64 feet per second.
01:12
All right.
01:13
Then you're asked to find the instantaneous velocity after five seconds.
01:22
So that'll be negative 32 times 5 plus 96.
01:42
And that will be negative 64 feet per second.
01:55
All right, then the next thing you're asked to do is find the instantaneous velocity when the debris hits the ground.
02:03
So hits the ground when s of t equals zero.
02:18
So that's the first thing that we'll do...