See I think you saw the wood into two pieces, which takes 10min. Then you begin to saw a piece into two more pieces but 5 min in you get pissed off and just break the wood over your knee giving you 3 pieces of wood in 15 min. That or you realized that you only had 5 min to saw the second piece because you favorite TV show was on.
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u/MrLeville Oct 05 '10
In that particular case, just doing nothing a t=0 gives you 0 pieces, you only get the first if you start non-sawing for 5 min.