A ball of mass math xmlns=http://www.w3.org/1998/Math/MathMLmim/mi/math moving with speed u unde...

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A ball of mass math xmlns=http://www.w3.org/1998/Math/MathMLmim/mi/math moving with speed u undergoes a head on elastic collision with a ball of mass math xmlns=http://www.w3.org/1998/Math/MathMLmin/mimim/mi/math initially at rest. The fraction of the initial energy transferred to the second ball is :-
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