{ The natural lengths of massless spring is }x}{ (spring constant }=k), it is slowly stretched by }} applying an external force. The work done to }{ stretch the spring from length }3x to }4x is }}{ (1) }1,5kx^2}{ (2) }2.5kx^2}{ (3) }4kx^2}{ (4) }kx^2

{ The natural lengths of massless spring is }x}{ (spring constant }=k)

1.	{ The natural lengths of massless spring is }x}{ (spring constant }=k), it is slowly stretched by }} applying an external force. The work done to }{ stretch the spring from length }3x to }4x is }}{ (1) }1,5kx^2}{ (2) }2.5kx^2}{ (3) }4kx^2}{ (4) }kx^2
Answer» { The natural lengths of massless spring is }x}{ (spring constant }=k), it is slowly stretched by }} applying an external force. The work done to }{ stretch the spring from length }3x to }4x is }}{ (1) }1,5kx^2}{ (2) }2.5kx^2}{ (3) }4kx^2}{ (4) }kx^2

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{ The natural lengths of massless spring is }x}{ (spring constant }=k), it is slowly stretched by }} applying an external force. The work done to }{ stretch the spring from length }3x to }4x is }}{ (1) }1,5kx^2}{ (2) }2.5kx^2}{ (3) }4kx^2}{ (4) }kx^2

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