S=V0t-gt²/2 =>S+gt²/2=V0t => V0=S/t+gt/2=10/1+10·1/2=15 м/с
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S=V0t-gt²/2 =>S+gt²/2=V0t => V0=S/t+gt/2=10/1+10·1/2=15 м/с