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v in (-oo:+oo)
600 = (12*v^2)/2 // - (12*v^2)/2
600-((12*v^2)/2) = 0
600-6*v^2 = 0
-6*v^2 = -600 // : -6
v^2 = 100
v^2 = 100 // ^ 1/2
abs(v) = 10
v = 10 or v = -10
v in { 10, -10 }
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