Question

a ball x of mass 1 kg traveling at 2 metre per second has head on collision with an identical balls while at rest x stops and y moves off calculate the velocity of y after the collision

Answer 1

m1u1+m2u2=m1v1+m2v2
1×2+1×0=1×0+1×V2
2=V2
hence velocity of y is 2m/s