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(eq. 1) into: Equation 3 Note: We could also have written 𝐹−𝑚𝑥̈ =0 instead of 𝑚𝑥̈ −𝐹 =0, which would lead to a different expression for total energy which would also be physically and mathematically valid (in the sense that it would also be conserved with time). But it would ultimately be a false