m*g*(H-h)=m*v²/2
v²=2*g*(H-h)
m*g=m*v²/R
R=2*(H-h)=2*(78-60)=36 м
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Verified answer
m*g*(H-h)=m*v²/2
v²=2*g*(H-h)
m*g=m*v²/R
R=2*(H-h)=2*(78-60)=36 м
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