a/ \(t=\sqrt{\dfrac{2h}{g}}=5\left(s\right)\)
b/ \(s_1=\dfrac{1}{2}gt_1^2=\dfrac{1}{2}.10.2^2=20\left(m\right)\)
c/ \(s_1'=s_1-\dfrac{1}{2}.10.1^2=15\left(m\right)\)
d/ \(s_2=h-s_3'=125-\dfrac{1}{2}.10.4^2=45\left(m\right)\)
e/ \(s_3=h-\dfrac{1}{2}.10.3^2=80\left(m\right)\)
f/ \(t=\sqrt{\dfrac{2h}{g}}=\sqrt{\dfrac{2.45}{10}}=3\left(s\right)\)
g/ \(s_4=h-s'=125-45=80\left(m\right)\)
\(t'=\sqrt{\dfrac{2h}{g}}-\sqrt{\dfrac{2h'}{g}}=1\left(s\right)\)
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