A spring of stiffness 1000 N/m is stretched initially by 100 mm from the undeformed position. The work required to stretch it by another 100 mm is
A. 5 N-m
B. 7 N-m
C. 10 N-m
D. 15 N-m
Answer: Option D
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Potential Energy = 1/2 * k[(0.2)^2 - (0.1)^2].
= 15 N-m.