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V=400m/s
t= V*s
t=o,69m * 400m/s
t=276s
s=69cm=0,69m
Vo=0m/s
a=Vk-Vo/t
s=at²/2
s=1/2*Vk-Vo/t *t² (²z t skracamy z t które jest pod Vk-Vo)
s=1/2*Vk-Vo *t |:Vk-Vo
1/2t=s/Vk-Vo |*2
t=2s/Vk-Vo
t=2*0,69/400=0,00345s