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v in (-oo:+oo)
(1/2)*v^2 = 10 // - 10
(1/2)*v^2-10 = 0
1/2*v^2 = 10 // : 1/2
v^2 = 20
v^2 = 20 // ^ 1/2
abs(v) = 2*5^(1/2)
v = 2*5^(1/2) or v = -(2*5^(1/2))
v in { 2*5^(1/2), -(2*5^(1/2)) }
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