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here only internal forces are responsible for motion ...no external force acts on the system so
momentam of system will remain conserved...
initail momentam = 0 = final momentam
let final velocities of m,2m are v1 , v2 then
mv1 + 2mv2 = 0
v1 = -2v2 ....................1
now applying energy conservation
TE(total energy) = Kq.2q/x (initial)
TE = kq.2q/2x + (1/2)mv12 + (1/2)2mv22 (final)
since energy is conserved so
(1/2)mv12 + (1/2)2mv22 + kq.2q/2x = kq.2q/x ....................2
from eq 1 substituting v1 in eq 2
2mv22 + mv22 = kqq/x
v2 = [kq2/3x]1/2
v1 = 2[kq2/3x]1/2 (ans1)
total change in KE = (1/2)mv12 + (1/2)2mv22 = work done (this is called work energy theorem)
from eq 2 , change in KE = kq2/x = net workdone on A,B (ans3)
work done on A is change in KE of A = (1/2)mv12 = 2mkq2/3x (ans2)
approve if u like my ans
But why in finding out work done, we have not considered the electrostatic potential energy due to the other charge?
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