First slide
Gravitaional potential energy

The masses, each of mass m are kept on the vertices of an equilateral triangle of side a. Find the work needed to be done to change the length of the triangle twice of its original value.


By the work-energy theorem we can write that
Wext +Wg=Δ(K.E)=0Wext=Wg=(ΔU)=ΔUWext =3Gm22a3Gm2a=3Gm22a

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