Two balls, each with a mass of 0.5 kg, collide on a pool table. is the law of conservation of momentum satisfied in the collision? explain why or why not

During the collision between two balls on the pool table there is no external force along the line of collision between them

Since there is no external force on it so here we can say

here we have

so we can say

since there is no external force so we can say during the collision the momentum of two balls will remain conserved

i believe the answer would be:

d. violin, clarinet, french horn, and tuba