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Strela zasiahne strom rýchlosťou 200 m/s a prenikne do hĺbky 8 cm. Aká je hmotno...

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Strela zasiahne strom rýchlosťou 200 m/s a prenikne do hĺbky 8 cm. Aká je hmotnosť strely, ak odpor dreva je 10⁴ N?

m = 20 g

m = 0,4 kg

m = 0,08 kg

m = 40 g

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