0:00
All right.
00:01
So in this case, we have a ball spring system.
00:05
So what is involved? list what's included in this system.
00:11
So we have a ball.
00:14
We have the spring.
00:16
And that creates potential energy.
00:29
And if the system is in motion, kinetic energy.
00:39
So if you're talking about just objects, it would just be the ball in the spring.
00:42
But if you're talking about types of energies, then it would be potential energy, and then if the spring moves, it would be kinetic energy as well.
00:50
So next, if the spring is compressed to 7 .6 centimeters, how much energy is stored.
01:23
And what we can use is we can use the energy stored inside a spring is equal to 1 .5k times x squared.
01:34
So the energy is going to equal one half.
01:39
Our k is 2450, so 2450 newtons per meter.
01:48
And our displacement, we have to convert this right, 0 .076 meters.
01:55
Since we want this meter to cancel with this meter, there are 100 centimeters in one meter.
02:02
And so therefore, if we do this math, we're going to get 2450 times 0 .076 multiplied by a half.
02:21
We're going to get that our energy stored in the spring is equal to 93 .1.
02:33
Whoops.
02:34
And i forgot my square.
02:38
So this actually is going to be less.
02:44
So if we actually do it right, we pull up all these numbers in.
02:49
We're going to get 7 .08 joules.
02:54
So that's the energy inside of the spring, stored inside of the spring, if it gets pulled back by that much.
03:04
So now if we release the spring, it shoots the ball, and we want to know what is the speed of the ball.
03:34
So basically, if we release this spring, spring from rest, it would shoot the ball out.
03:40
And we want to know what the speed of the ball is right as it's getting shot.
03:45
And so we can use conservation.
03:49
We can use conservation of energy...