Question
K is the force constant of a spring. The work done in increasing its extension from l₁ to l₂ will be
Options :
K(l₂-l₁)
K(l₂+l₁)/2
K(l₂²-l₁²)
K(l₂²-l₁²)/2
Answer :
K(l₂²-l₁²)/2
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