A spring has a natural length of 20 cm. If a 25-N force is required to keep it stretched

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A spring has a natural length of 20 cm. If a 25-N force is required to keep it stretched to a length of 30 cm, how much work is required to stretch it from 20 cm to 25 cm?
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You should explain what you are doing a little bit more instead of just saying what the values are

timothynye
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Hi, can I ask after first step figuring out f(x) = 250x. Then because I know Work done = Force times distance, why the answer 250* 0.05* 0.05 is not the same with the answer you gave to us. Can you explain it for me? Thank you very much

yichenli
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from your graph, I am confused about how does 20cm +0.1m= 30 cm?

jessiechen