1)
[tex]Dane:\\h = 2 \ m\\s = 3 \ m\\g = 10\frac{m}{s^{2}}\\Szukane:\\a = ?\\\\Rozwiazanie\\\\F_{w} = m\cdot a\\i\\F_{w} = F_{s} = mgsin\alpha\\\\ma = mgsin\alpha \ \ /:m\\\\a = gsin\alpha\\\\ale\\\\sin\alpha = \frac{h}{s}=\frac{2 \ m}{3 \ m} = 0,667\\\\a = 10\frac{m}{s^{2}}\cdot0,667\\\\\boxed{a = 6,67\frac{m}{s^{2}}}[/tex]
2)
[tex]Dane:\\n =600\\t = 2 \ min = 2\cdot60 \ s = 120 \ s\\m = 2 \ kg\\r = 40 \ cm = 0,4 \ m\\Szukane:\\f = ?\\v = ?\\F_{d} = ?\\\\Rozwiazanie\\\\f = \frac{n}{t}\\\\f = \frac{600}{120 \ s}\\\\\boxed{f = 5 \ Hz}[/tex]
[tex]v = 2\pi rf\\\\v = 2\cdot3,14\cdot0,4\cdot5\frac{1}{s}\\\\\boxed{v = 12,56\frac{m}{s}}\\\\\\F_{d} = \frac{mv^{2}}{r}\\\\F_{d} = \frac{2 \ kg\cdot(12,56\frac{m}{s})^{2}}{0,4 \ m}\\\\\boxed{F_{d} \approx788,8 \ N}[/tex]