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- Thread starter r-soy
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- #2

Gib Z

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The next question is completely wrong, its not even an arithmetic series because the difference of consecutive terms is not constant. Try again.

- #3

Mentallic

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The formula for a sum of an arithmetic series:

[tex]S_n=a+(a+d)+(a+2d)+...+(a+(n-1)d)=\frac{n}{2}\left(2a+(n-1)d\right)[/tex]

Since you're looking for the distance travelled in 9 seconds, you're looking for [itex]S_9[/itex]. You substituted [itex]n=T_9[/itex] rather than n=9.

And honestly, look at how ridiculous your answer seems: [itex]15+45+75+...+255 = 975,375[/itex]

So a penny falls 1 million feet in 9 seconds?

- #4

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Thanks

Now I understand

Now I understand

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