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F = 0,4 kN = 400 N
t = 3 s
m = 2 kg
Szukane :
h = ?
F = m * g
g = (2*h)/t^2
F = m * g = m *(2*h)/t^2
F * t^2 = 2*m*h
h = (F * t^2)/2*m
h = (400*9)/4
h = 100* 9 = 900 m