zadanie 1
m = 75 kg
a = 10 \frac{m}{s^2}
F = ?
F=m*a
F=75kg*10\frac{m}{s^2}=750\frac{kg*m}{s^2}=750N (niuton) <–odpowiedź
zadanie 2
z={v_o}*t
h=\frac{gt^2}{2}=>t=\sqrt{\frac{2h}{g}}
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z = v_o\sqrt{\frac{2h}{g}}
z = 3h
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v_o\sqrt{\frac{2h}{g}}=3h |^2 (obie strony równania do kwadratu)
\frac{{v_o}^2*2h}{g}=9h^2|*g
{v_o}^2*2h=9h^2g|:h
2{v_0}^2=9gh
{v_o}=\sqrt{\frac{9gh}{2}}=\sqrt{\frac{9*10\frac{m}{s^2}*5}{2}}=\sqrt{225\frac{m^2}{s^2}}=15m/s <–odpowiedź