21.6=1/2*30*v2

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Solution for 21.6=1/2*30*v2 equation: 


v in (-oo:+oo)

21.6 = 30*(1/2)*v^2 // - 30*(1/2)*v^2

21.6-(30*(1/2)*v^2) = 0

21.6-15*v^2 = 0

-15*v^2 = -21.6 // : -15

v^2 = 1.44

v^2 = 1.44 // ^ 1/2

abs(v) = 1.44^(1/2)

v = 1.44^(1/2) or v = -1.44^(1/2)

v in { 1.44^(1/2), -1.44^(1/2) }

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