I Have A Rather Short Question For Part D As We Know That The Change In Energy W (1)

I have a rather short question for part d. As we know that the change in energy= work done, I do not understand why, to solve part d, the equation is 0.5*4.3*(4.56)^2=44.7 ? Why is the change in energy 44.7 joules and not 0.5*3.5*(5.6)^2 – 44.7? Clearly the change in energy is 10 joules.

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