When a 4 kg mass is hung vertically on a light spring that obeys Hooke – McqOptions

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1.	When a 4 kg mass is hung vertically on a light spring that obeys Hooke's law, the spring stretches by 2cms. The work required to be done by an external agent in stretching this spring by 5cms will be \[(g=9.8\text{ }m/se{{c}^{2}})\]
A.	4.900joule
B.	2.450joule
C.	0.495 joule
D.	0.245 joule
Answer» C. 0.495 joule

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