If it requires 9.0 j of work to stretch a particular spring by 2.0 cm from its equilibrium length, how much more work will be required to stretch it an additional 4.0 cm?

As we know that work done to stretch the spring will be given as

so here we have

so we have

now we need to find the work done to stretch the spring from x = 2 cm to x = 4 cm

here we have

now we have

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explanation: