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Zdravím, vedel / resp. pozná niekto zariadenie kt. funguje na princípe zrkadiel a vedel by tento princíp a celkovo “fyziku” v tom zariadení popísať?
Svetlana už vyše roka pravidelne beháva. Na prebehnutie tej istej trasy dnes potrebuje už len 80% času, ktorý potrebovala na začiatku. O koľko percent sa zvýšila Svetlanina bežecká rýchlosť?
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