Two billiard balls of mass $50g$ moving in opposite directions with speed of $16m{s}^{-1}$ collide and rebound with the same speed. What is the impulse imparted by each ball to the other?

Given,

Mass, $m=50gram=0.05kg$

Initial velocity, $V_{initial}=16m{s}^{-1}$

Final velocity, $V_{final}=-16m{s}^{-1}$

Change in momentum is $\Delta P=m(V_{final}-V_{inital})$

$\Delta P=0.05\times (16-(-16\left)\right)=1.6kgm/s$

Impulse imparted to each ball due to collision is $1.6kgm/s$ .