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<blockquote data-quote="Coredump" data-source="post: 1639177" data-attributes="member: 6939">For your uses, this is pretty much true. But both of these statements have qualifiers. They are not always true for all things.Yeah, I figured out the mistake I made... when I re-did it, I got about the same as you did.But.... note for later. This calculation assumes 35.888 is the *initial* velocity. Not the velocity after a full second of acceleration.&nbsp;This is, in essence, the exact same method that babomb used. I can't say that it doesn't work, I just have conflicting instincts. Sometimes it seems better than my method, and sometimes worse.Sorry, but the velocity is from the beginning. Thus acceleration is, in effect, instantaneous. But for the method you are applying (conservation of momentum, ala the rocket example) the acceleration isn't an issue anyway.&nbsp;Using english units isn't quite as elegant as metric. And your method here is not the same as the example below. But using the example below, you get 207N as an answer. (Part of the problem is using lb as mass and as force. Plus you are trying to combine acceleration with conservation of momentum.)Cool. What website was it. I am trying to brush up on this stuff some more... and I have exhausted my old textbooks.You and Babomb used (essentially) the same logic, and came to the same conclusion. The difference in final force stems from how you measured the initial velocity. (horizontal or vertical)Not sure how to rectify the differences between what you two got and what I got....&nbsp; Have to look into this some more.edit: formatting</blockquote>

[QUOTE="Coredump, post: 1639177, member: 6939"] For your uses, this is pretty much true. But both of these statements have qualifiers. They are not always true for all things. Yeah, I figured out the mistake I made... when I re-did it, I got about the same as you did. But.... note for later. This calculation assumes 35.888 is the *initial* velocity. Not the velocity after a full second of acceleration. This is, in essence, the exact same method that babomb used. I can't say that it doesn't work, I just have conflicting instincts. Sometimes it seems better than my method, and sometimes worse. Sorry, but the velocity is from the beginning. Thus acceleration is, in effect, instantaneous. But for the method you are applying (conservation of momentum, ala the rocket example) the acceleration isn't an issue anyway. Using english units isn't quite as elegant as metric. And your method here is not the same as the example below. But using the example below, you get 207N as an answer. (Part of the problem is using lb as mass and as force. Plus you are trying to combine acceleration with conservation of momentum.) Cool. What website was it. I am trying to brush up on this stuff some more... and I have exhausted my old textbooks. You and Babomb used (essentially) the same logic, and came to the same conclusion. The difference in final force stems from how you measured the initial velocity. (horizontal or vertical) Not sure how to rectify the differences between what you two got and what I got.... Have to look into this some more. edit: formatting [/QUOTE]

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