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v in (-oo:+oo)
20 = (v^2)/10 // - (v^2)/10
20-((v^2)/10) = 0
-1/10*v^2 = -20 // : -1/10
v^2 = 200
v^2 = 200 // ^ 1/2
abs(v) = 10*2^(1/2)
v = 10*2^(1/2) or v = -(10*2^(1/2))
v in { 10*2^(1/2), -(10*2^(1/2)) }
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