Aisyah Iskandar's answer to Rachel's Secondary 3 E Maths Singapore question.
The final expression for u needs to have + -.
We must assume that the equation is just an ordinary algebraic equation and not a physics equation (work done = difference of kinetic energies), so the u must have a + -.
We must assume that the equation is just an ordinary algebraic equation and not a physics equation (work done = difference of kinetic energies), so the u must have a + -.
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