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t in (-oo:+oo)
200 = 5*(1/2)*t^2 // - 5*(1/2)*t^2
200-(5*(1/2)*t^2) = 0
(-5/2)*t^2+200 = 0
-5/2*t^2 = -200 // : -5/2
t^2 = 80
t^2 = 80 // ^ 1/2
abs(t) = 4*5^(1/2)
t = 4*5^(1/2) or t = -(4*5^(1/2))
t in { 4*5^(1/2), -(4*5^(1/2)) }
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