3) A=4 м Т=12 с v=1/T=1/12=0.083 Гц
4) t=2*S/v=2*68/340=0.4 c
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3) A=4 м Т=12 с v=1/T=1/12=0.083 Гц
4) t=2*S/v=2*68/340=0.4 c
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