00:01
So this question, we actually need to use the graphic method.
00:04
So this is a hint that's section 6 -2, but what section 6 -2 is about, it's about trying to figure out a quantity by looking at the graph of it.
00:18
But let me just do a quick go -through of this method.
00:23
What it means is that in this case, for example, for a, we need to use a graphic method to estimate the total impulse.
00:30
What is total impulse? total impulse is the change of momentum.
00:34
And that is mass times delta v, but it's also f times delta t.
00:40
So it's the multiplication of f and delta t.
00:45
Now we have this graph with the x -axis as t and the y -axis as f.
00:53
And there is an area here.
00:56
How do we calculate it, say if it's a square? the area of the square is also f times t.
01:02
So what this makes is that by counting the area in this ft graph, the area will give us the momentum because both of them are a multiplication of f and data t.
01:15
So that's what we're trying to do here.
01:17
So a, we need to find the total impulse, and what we're doing is we're just trying to count, we're just need to know the area under this curve.
01:26
And this is a precise calculation of this area needs calculus, but we're not doing that.
01:32
We're just doing a simple estimation.
01:34
So we're doing curve squares.
01:37
So if there are different ways of doing it, one way to do it is to try to estimate this curve is a triangle.
01:48
So we try to estimate a triangle probably here because if we estimate here, we might overestimbing.
01:56
Too much.
01:58
So we roughly try to make sure there is the same amount of area that is above our line and below our line...