00:01
Hi, in this question we have.
00:03
A process occurs with in which the system's potential energy decreases or the system does work on the environment.
00:11
The change in kinetic energy is, let's say a body does, say we have a block like this.
00:20
And then it loses some potential energy by, i say, gravity is not potentially by coming down in height.
00:26
And i say it was moving at some velocity v in the horizon that direction and it had some in short kinetic energy.
00:35
So we told that the system does work, sorry, the system does work on the environment, meaning that work is done against the system.
00:48
So the system loses work, system loses energy.
00:52
So the system loses kinetic energy, meaning that the kinetic energy is reduced.
00:57
But at the same time, since we assume that the mechanical is constant is conserved, and potential energy, is reduced to mean that kinetic energy goes up from the potential energy point of view from pe can see energy goes up and now from work the kinetic energy goes down because the system does work system loses energy so we don't actually know by how much so we can actually know the amount we don't know that this actually cancels out this or this is greater than this or this is less than this so it should be unknown and like i just said the reason because the change in potential energy may be greater as well as less than the work done and the work the system does on the environment...