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Mathematics 21 Online
OpenStudy (anonymous):

A ball is thrown upwards, and returns to the ground after 5 seconds. After each bounce, the time until it returns to earth is multiplied by a factor of 2/3. Find the total time which passes before it stops bouncing.

OpenStudy (anonymous):

Make a geometric series and calculate sum(s) accordingly....

OpenStudy (raden):

shortcut : ((3+2)/(3-2)) * 5

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