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Q.

Two masses, each 5 kg, are attached to the two ends of a spring of spring constant 40 N/m. The masses are pulled away from each other and the spring gets stretched by a length 20 cm. work done by the spring on each mass is :

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a

0.8 J

b

-0.4 J

c

- 0.6 J

d

- 0.8 J

answer is A.

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Detailed Solution

W=14kx2

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