By the law of energy conservation:
"mgh=\\frac{mv^2}{2}+mgh^{'}"
"gh=\\frac{v^2}{2}+gh^{'}"
"g(h-h{'})=\\frac{v^2}{2}"
"h-h^{'}=\\frac{v^2}{2g}"
"h^{'}=h-\\frac{v^2}{2g}"
"h{'}=5-\\frac{2500}{20}=-120"
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