h=Vot-gt^2/2
Vк=0=Vo-g0.5t=Vo-30=>Vo=30м/с
h=30*3-10*9/2=90-45=45м
Vк=Vo=30м/с
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h=Vot-gt^2/2
Vк=0=Vo-g0.5t=Vo-30=>Vo=30м/с
h=30*3-10*9/2=90-45=45м
Vк=Vo=30м/с