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https://session. masteringphysics.com/myct/itemView?assignmentProblemID-76428863&offset-prev; PH 1113-04 Signed in as Almalik stoale Problem 6.28 E previous I 5of 10 next Problem 6.28 Part A If it requires 7.0 J of work to stretch a particular spring by 2.0 cm from its equilibrium length, how much more work will be required to stretchit an additional40 em? Express your answer to two significant figures and include the appropriate units. W. Valud Units l Submit My Answers Give Up Feedback Continue

Explanation / Answer

formula for wordone to strech string is

W = (1/2)kx^2
7.0 J = (1/2)k(0.020)^2
k = 35000

the additional work needed to strech from 2 xm to 4 cm is

W =W_4 cm - W_ 2cm
= (1/2)(35000)(0.04)^2 - 1/2 ( 35000) ( 0.02)^2

= 21J

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