Two balls of radius r each are placed at...

Two balls of radius r each are placed at a distance R and released . The speed of each ball when they collide

`v = sqrt(2-Gm((1)/(R)+1/r))`

`v = sqrt(-Gm(1/R-1/(2r)))`

`v=sqrt(-2Gm(1/R+1/(2r)))`

`v=sqrt(-Gm(1/(2R)+1/(2r)))`

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