[tex]Zadanie\\\\a)\\\\m=?\\\\E=\frac{1}{2}mV^{2}\ \ \ \mid\cdot2\\\\2E=mV^{2}\ \ \ \mid:V^{2} \\\\\frac{2E}{V^{2} }=m\\\\m=\frac{2E}{V^{2} }\\\\Zal.\ V\ne0\\\\b)\\\\V=?\\\\ E=\frac{1}{2}mV^{2}\ \ \ \mid\cdot2\\\\2E=mV^{2}\ \ \ \mid:m\\\\\frac{2E}{m}=V^{2}\\\\V=\sqrt{\frac{2E}{m} }\\\\Zal.\ m\ne0[/tex]
