The energy required, E = ΔPE
E = (1/2)k(d2 - 02) = (1/2)kd2
During which interval is the largest amount of energy required to stretch the spring?
a) From x = 0 to x = d
b) From x = d to x = 2d
c) From x = 2d to x = 3d
d) The energy required is the same in all three intervals
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