Test Academy | K is the force constant of a spring. The work done in increasing its extension from l₁ to l₂ will be K(l₂-l₁), K(l₂+l₁)/2, K(l₂²-l₁²), K(l₂²-l₁²)/2

Question

K is the force constant of a spring. The work done in increasing its extension from l₁ to l₂ will be

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