Q. 75.0( 1 Vote )

Two identical balls each of mass 4kg are moving towards each other with speeds 2 ms–1 and 3 ms–1 respectively. They undergo head on perfectly elastic collision. Then impulse imparted by one ball on other is

Answer :

In a perfectly elastic collision

(i) Linear momentum is conserved


(ii) Kinetic energy is conserved


(iii) Total energy is conserved


In case of a perfect elastic collision of two identical masses the velocities are interchanged.


So if initial velocities of ball A and Ball B are and respectively, then the final velocities and such that





Then impulse imparted by one ball on other is




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