00:01
Alright, so let's say we have a pinball machine where this little section at point b is elevated a distance of 0 .3 meters above point a.
00:11
And at point a, that's where a spring is being compressed with the ball, the pinball on it, and the mass of the pinball is, let's see, 0 .0585 kilograms.
00:24
And the spring constant of our spring, we're told, is 675 newtons per meter, and it's compressed a distance we'll call delta x of 0 .065 meters.
00:39
So we want to know what is the speed at point b if the ball slides without rolling.
00:44
So we can basically use that.
00:47
The initial energy of the system is all potential energy.
00:52
It's 1 .5k delta x squared.
00:53
And the final energy of the system is going to be the kinetic energy at point b plus the potential energy at point b.
01:03
So we'll call this mgh...