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In the shown figure, the spring and stri...

In the shown figure, the spring and string is ideal. The spring the stiffness of `100 N//m` and `m = 1 kg` friction exists between mass 2m and surface with coefficient `mu = 0.8`. The system is released with spring from its relaxed position. Based on above data, answer the following question: (take `g = 10 m//s^(2)`)

Magnitude of work done by gravity during the motion of system is :

A

0.8 J

B

1.6 J

C

0.4 J

D

4 J

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The correct Answer is:
B
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