00:01
Welcome back to numrod.
00:01
My name is kevin sharak.
00:02
Let's mention we have two identical balls that are thrown from the top of a cliff.
00:06
So we'll draw some kind of cliff here and take two different balls.
00:10
Maybe we'll make one red and we'll make one black.
00:13
Assume they're at the same height.
00:14
One is thrown straight up and the other one straight down.
00:17
So how do the kinetic energies and the speeds of the ball compare as they strike the ground? okay.
00:23
So we're going to be imparting some kind of velocity up for this one and the other one is going to be falling down with what we'll.
00:30
Assume will be the same velocity.
00:32
Okay, so let's now consider what happens.
00:34
In the first situation, let's look at the black situation.
00:38
We can say the sum of all energy initial plus any work done is equal to the sum of all energy final.
00:45
Since we know we're starting off with some kind of kinetic energy, we can just simply write that in.
00:49
And that's going to be the kinetic energy...