1.
[tex]Dane:\\v_{o} = 0\\t = 2 \ s\\m = 2 \ 000 \ kg\\F = 250 \ N\\Szukane\\s = ?\\\\Rozwiazanie\\\\Z \ II \ zasady \ dynamik \ Newtona\\\\a = \frac{F}{m} = \frac{250 \ N}{2000 \ kg}= 0,125\frac{N}{kg} = 0,125\frac{m}{s^{2}}\\\\s = \frac{1}{2}at^{2}\\\\s = \frac{1}{2}\cdot0,125\frac{m}{s^{2}}\cdot(2 \ s)^{2}\\\\\boxed{s = 0,25 \ m}[/tex]
2.
[tex]Dane:\\v_{o} = 0\\m = 2 \ kg\\F = 1 \ N\\s = 1 \ m\\Szukane:\\t = ?\\\\Rozwiazanie\\\\a = \frac{F}{m} = \frac{1 \ N}{2 \ kg} = 0,5\frac{N}{kg} = 0,5\frac{m}{s^{2}}\\\\s = \frac{at^{2}}{2} \ \ /\cdot2\\\\at^{2} = 2s \ \ /:a\\\\t^{2} = \frac{2s}{a}\\\\\underline{t = \sqrt{\frac{2s}{a}}}\\\\t = \sqrt{\frac{2\cdot1 \ m}{0,5\frac{m}{s^{2}}}} = \sqrt{4 \ s^{2}}\\\\\boxed{t = 2 \ s}[/tex]
