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January 25, 2015

January 25, 2015

Posted by **Anonymous** on Saturday, May 26, 2012 at 11:15am.

- physics -
**bobpursley**, Saturday, May 26, 2012 at 1:17pm60+.7*60(2)+.7^2(60)*2+...

Sum from n=0 to large [2*60*.7^n) -60

sum 120*.7^n -60

geometric ratio,

= 120/(1-.7) - 60

= 120/.3 -60

=400-60=340

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