00:01
The impulse that the engine applies to the rocket, well, impulse is the change in force times a change in time, which we might express in calculus terms as the integral of fdt.
00:24
If we have a plot of force against time, as we do in this case, then the impulse is simply the area under the curve that we draw.
00:39
With a triangle here, with the maximum force being 1 ,000 newtons, and the maximum time being 30 seconds, the impulse is simply the area of this triangle, one half base times height, or one half, 1 ,000 newtons times 32nd, which comes out to 1 .5 times 10 to the 4 newton second.
01:31
Then we can ask you, what time does the rocket reach its maximum speed? well, let's think about it.
01:38
We're starting off at a velocity of 65 meters per second, and then we are firing our rocket...