Proszę o pomoc w zadaniach 21-24 Dam NAJ i dużoo punktów!!!!

[latex]21.\ t = 10 s\ v_0 = 0 m/s\ v_k = 20 m/s\ \ a = frac{v_k - v_0}{t} = 2 m/s^2 \ s = frac{at^2}{2} = 100 m \ \ 22. \ t = 50 s\ v_0 = 0 m/s\ v_k = 54 km/h = 15 m/s\ \ a = frac{v_k - v_0}{t} = 0,3 m/s^2 \ s = frac{at^2}{2} = 375 m \ \ 23. \ a = 0,4 m/s^2\ s = 500 m \ \ s = frac{at^2}{2} \ t = sqrt{ frac{2s}{a} } = 50 s \ v = at = 20 m/s \ \ 24.\ a =3 m/s^2\ v_0 = 0 m/s\ v_k = 30 m/s \ \ a = frac{v_k - v_0}{t} = 10 s[/latex] [latex]s = frac{at^2}{2} = 150 m[/latex]