Odpowiedź :
[tex]dane:\\W = 8 \ 300 \ J = 8 \ 300 \ N\cdot m\\h = 17 \ m\\m_1 = 40 \ kg \ - \ masa \ Zosi\\m = m_1 + m_2\\g = 10\frac{m}{s^{2}} = 10\frac{N}{kg}\\szukanew:\\m_2 = ?\\\\Rozwiazanie\\\\W = E_{p} = mgh\\\\W = mgh \ \ /:gh\\\\m = \frac{W}{gh}\\\\m = \frac{8300 \ N\cdot m}{10\frac{N}{kg}\cdot17 \ m} =48,82 \ kg\\\\m_1 + m_2 = m\\\\m_2 = m-m_1\\\\m_2 = 48,82 \ kg - 40 \ kg\\\\m_2 = 8,82 \ kg[/tex]
Odp. Masa zakupów m₂ = 8,82 kg.