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Potřebovala bych vyřešit celá zadaná dvě cvičení (dole na obrázků). Vždycky mi to vyjde o trochu jinak a nevím, co dělám špatně, tak bych ocenila postup. Děkuju moc.
Prosím o pomoc, nevím jak vypočítat. Jádro helia (tvořené dvěma protony a dvěma neutrony - hmotnost každé této částice uvažujme přibližně 1,67 ∙ 10−27 kg) vlétlo rychlostí o velikosti 20000 km ∙ s…
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