Question

K=250 H/м N=20 t=16c m-?

Answer 1

T=t/n=16/20=0.8 c
T=2*π*√(m/k)
m=(T/(2*π))²*k=(0.8/(2*3.14))²*250≈4 кг
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Answer 2

I see that you have provided a series of variables without specific units or context. Could you please clarify your question and provide more information about what you are trying to calculate or the problem you need assistance with?