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[" 3.When a "4kg" mass is hung verticall...

[" 3.When a "4kg" mass is hung vertically on a light spring "],[" that obeys Hooke's law,the spring stretches by "2cm" ."],[" The work required to be done by an external agent in "],[" stretching this spring by "5cm" will be "(g=9.8" metrs/sec "^(2)" ) "],[[" (a) "4.900" joule "," (b) "2.450" joule "],[" (c) "0.495" joule "," (d) "0.245" joule "]]

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