Posted by **tracey** on Tuesday, November 7, 2006 at 5:59pm.

I've asked the question "what is the fundamental equation to find the speed of a rocket." That's what I am having problems with because there are more than one. How do I know which one is the preferred equation used?

The preferred equation is the one that suits what you are doing.

I would go with the impulse equation:

Force*time=mass*changeinvelocity

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