two ball each of mass 25 kg moving in opposite direction with the speed of 18 km/h collide and rebound with same velocity what is the impulse imparted to each ball due to other?

Mass of each ball = 25 kg

Initial velocity of first ball =18km/h= 5m/s

Initial velocity of second ball =-18km/h =-5m/s

 initial momentum of first ball, p_i = 25 x 5 =125kgm/s

Initial momentum of second ball, p_i = 25 x -5 =-125 kgm/s

after collision, the balls rebound without changing magnitude of their speeds

So, Final momentum of first ball, p_f = -125kgm/s

final momentum of second ball, p_f = 125kgm/s

Impulse imparted to first ball = Change in its momentum 

                                            = p_f -p_i = -125 -125 =-250kgm/s

Impulse imparted to second ball = Change in its momentum 

                                                      = p_f -p_i = 125 - (-125) =250 kg m/s