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2=0.5*9.81t^2
We move all terms to the left:
2-(0.5*9.81t^2)=0
We get rid of parentheses
-0.5*9.81t^2+2=0
We move all terms containing t to the left, all other terms to the right
-0.5*9.81t^2=-2
t=-2/1
t=-2
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