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If you really wanted to use a constant that's a little more precise than 3.00x10^8 m/s but less tedious than 2.99792x10^8 m/s, I'd suggest using 2.998x10^8 m/s. But then again it shouldn't matter too much as long as your final sig figs are correct.
I think ideally it would be easier to use 3.00x10^8 m/s for the speed of light because 1. that is what Lavelle uses and 2. because it's slightly easier to remember as well as write down when you are working at a faster pace to complete a test or so on. It should not throw off your sig figs and I'm not entirely sure but I think there should be some sort of leniency on sig figs as in there is a range of maybe .02 above or below the answer that you can be off on.
3.00 x 10^8 is acceptable to use in almost all cases since we do not need the specificity that the actual number implies. In a case where any said number could change the result and have a large effect, then you would use the 2.9 value, but we do not have that in this class.
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