[tex]\large\boxed{\begin{array}{l} \sf{S=\dfrac{1}{2}gt^2}\\\\\sf{S=\dfrac{1}{2}10\,m/s^2\cdot(2\,s)^2}\\\sf{S=5\,m/s^2\cdot4\,s}\\\sf{S=20\,m}\end{array}}[/tex]
[tex]\large\boxed{\begin{array}{l} \sf{h=80\,m-20\,m}\\\huge\boxed{\boxed{\boxed{\boxed{\sf{h=60\,m}}}}}\end{array}}[/tex]
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[tex]\large\boxed{\begin{array}{l} \sf{S=\dfrac{1}{2}gt^2}\\\\\sf{S=\dfrac{1}{2}10\,m/s^2\cdot(2\,s)^2}\\\sf{S=5\,m/s^2\cdot4\,s}\\\sf{S=20\,m}\end{array}}[/tex]
[tex]\large\boxed{\begin{array}{l} \sf{h=80\,m-20\,m}\\\huge\boxed{\boxed{\boxed{\boxed{\sf{h=60\,m}}}}}\end{array}}[/tex]