WITAM! Załączam zdjęcie 5 zadań z fizyki: Proszę o dokładne rozwiązanie. Daję NAJJ! z góry thx

zad1.   vp = ? a = 5m/s^2 t = 3s vk = 21 m/s   vk = vp + at 21 = vp + 18 21 - 18 = vp vp = 3m/s    zad2. a = 8m/s^2 vp = ? t = 10s s = 450m   s = vp x t + at^2/2 450 = 10vp + 8 x 100/2 450 = 10vp + 400 450 - 400 = 10vp 50 = 10vp /10 vp = 5m/s   zad 3. a1 = 0.5 m/s^2 a2 = 1.5m/s^2 s1 = ? s2 = ? t = 4s   s = at^2/2 s1 = 0.5 x 16/2 s1 = 4m   s2 = 1.5 x 16/2 s2 = 24/2 s2 = 12m   zad4.   g = 10m/s^2 h = 20m vk = ? t = ?   h = gt^2/2 20 = 10t^2/2 20 = 5t^2 /5 4 = t^2 t = 2s   vk = a x t vk = 10 x 2 vk = 20m/s   5 niewiem jak zrobic ..