дано V1= 45 км\ч a=30 V2- ?
tga=V1\V2
V2=V1*ctga=45*0,866\/0,5=78 км\ч
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дано V1= 45 км\ч a=30 V2- ?
tga=V1\V2
V2=V1*ctga=45*0,866\/0,5=78 км\ч