m*v1^2/2 = m*v2^2/2 + m*g*hv2^2 = v1^2-2*g*hv2 = sqrt(v1^2-2*g*h) = sqrt(15^2-2*10*10) = 5 м/с
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m*v1^2/2 = m*v2^2/2 + m*g*h
v2^2 = v1^2-2*g*h
v2 = sqrt(v1^2-2*g*h) = sqrt(15^2-2*10*10) = 5 м/с