When a 4 kg mass is hung vertically on a...

When a 4 kg mass is hung vertically on a light string that obeys Hooke's law, the spring stretches by 2 cm. The work required to be done by an external agent in stretching this spring by 5 cm will be (`g=9.8(metrs)/(sec^2)`)

`4.900 joule `

`0.450jolue `

`0.495 joule`

`0.245 joule`

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