00:01
Alright, so in this question we're asked, how much work is done on a rock that is lifted 200 kilogram rock that has lifted 3 meters.
00:11
So let's draw this out.
00:15
We have a object here that's 200 kilograms.
00:21
And what we're going to be doing is lifting it up 3 meters.
00:29
So to answer this question, we use a simple force equation.
00:35
For work, which states that work is just force times distance.
00:43
Work equals force times distance.
00:47
And we use this doing calculus by saying that work is going to be equal to the force times this delta dx right right here.
01:00
And what this dx refers to are these incremental, marginal, distances that is being that is moving this this object.
01:15
So force is actually quite easy.
01:18
We can get the force by looking at this object right here.
01:25
And we know that the equation for force for an object that doesn't undergo acceleration, constant velocity is just going to be force equals m g.
01:36
And that's going to give us 200 kilograms times 9 .8 meters...