00:01
Okay, let's draw our elevator.
00:04
Okay, let's write down some basics.
00:06
So we know mass is 1 ,457 kilograms.
00:12
We know friction force is 13 times 10 to the 3rd newton's.
00:21
I know velocity, which is 13 .75 meters per second.
00:31
And i know the distance, basically that you could say the displacement of the spring, which is three meters.
00:38
So we can think of this as energy.
00:41
Right.
00:42
So i know that the moment that that elevator starts touching the spring, it will have a certain kinetic energy, right? one half mv squared.
00:56
So it'll have that.
00:58
It will also have some sort of gravitational potential, right? we'll just say the original height is at the top of the spring, so three meters, and then when it's at the bottom, it's zero meters.
01:16
And then we also have acting against it the force from the friction force, the work done by friction.
01:25
And that should equal the energy stored in the spring whenever it's compressed entirely...