h=V0×t-(g×t^2)/2
V0= (h+(g×t^2)/2)/t
V0=(30+10×(2^2)/2)/2=25 м/с
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h=V0×t-(g×t^2)/2
V0= (h+(g×t^2)/2)/t
V0=(30+10×(2^2)/2)/2=25 м/с