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student_kiev, grigoriy, спасибо! I was finally able to understand the Russian of the problem and realized what I am supposed to find. I am sorry I am not able to attach The photo of the whole solution. in short: write the equation of y(x,α、v、).Next substitute y with rcosφ and x with rsinφ.find the m...

Please excuse me for writing in English! I can read Russian to some extent because I am from Bulgaria, but I do not dare to write or speak in Russian. My grammar is just too bad! I have been trying to solve the following problem, but without any success. ЗАДАЧИ по ФИЗИКЕ  Издание третье, исправленно...