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so in this video Im going to walk through an example it is in the textbook but its one of those examples that I think is really instructional and really confusing so the example were going to deal with here is sort of deriving the rocket equation and if you really understand whats going on in the derivation the rocket equation youre really getting a lot of the key ideas of this module around conservation of momentum so let me first sort of set up the idea of this a little bit so the idea is that we have this rocket and so this is a rocket and the way that a rocket works is it actually burns fuel and in burning the fuel expels hot gases out of the back of the rocket and if you think about this from a sort of system boundary perspective and sort of imagine a system boundary there as a rocket expels hot gases you have molecules that are crossing the system boundary going that way in other words they were they are carrying momentum thats going to the left and they are carrying that