Three masses 
and 400 kg are placed at the vertices of an equilateral triangle with sides 20 m. They are rearranged on the vertices of a bigger triangle of side 25 m and with the same center. The work done in this process 
J. (Gravitational constant 
)
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
Work done equals negative change in gravitational potential energy.
For three masses in an equilateral triangle, gravitational PE is 
.
Initial configuration (side 20 m):
Final configuration (side 25 m):
Work done:
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