(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

When a 75 gram mass is suspended from a vertical spring, the spring is stretched from a length of 4.0 cm to a length of 7.0 cm. If the mass is then pulled downward an additional 10.0 cm, what is the total work done against the spring force?

2. Relevant equations

U=mgh (Don't need the work equation because work = energy)

U= 1/2 k x^2 (equation for the elastic spring with potential energy.)

3. The attempt at a solution

mass = .075 kg

height = .21 m (.04+.07+.1 = .21m)

gravity = 9.81m/s^2

U=mgh

U= (.075)(9.81)(.21)

U= .15 J

I know the answer is wrong because the book says the answer is .21 J

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# Homework Help: What is the total work done against the spring force?

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