\(W=W_d+W_t=\dfrac{1}{2}mv^2+mgh=m\left(\dfrac{1}{2}.10^2+10.20\right)=...\left(J\right)\)
\(W_t=W_d=\dfrac{1}{2}W\Leftrightarrow mgh'=\dfrac{1}{2}.250m\Leftrightarrow10h'=\dfrac{1}{2}.250\Rightarrow h'=12,5\left(m\right)\)
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