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

2.450 joule

0.495 joule

0.245 joule

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