m=1,5 kg
y=6cm = 0,06 m
g=9,81 m/s2
g=10 m/s2
https://www.walter-fendt.de/html5/phcz/springpendulum_math_cz.htm
F=m*g
F=1,5*9,81
F=k*y
1,5*9,81=k*0,06
k=1,5*9,81/0,06
ω=√(k/m)
ω=√(1,5*9,81/0,06 / 1,5)
ω=√(9,81/0,06)
ω=12,786711852544421828569082737182
ω=2π/T = 2π*f
f=12,786711852544421828569082737182/(2*P)=2,0350683972241710401634035112601
f=2,035 Hz
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