Question

What can you say about the total momentum before and after the collision?

Answer 1

total momentum before n after collision in elastic collision is same . as K.E. and P.E. is conserved
hope it helps

Answer 2

The law of momentum conservation can be stated as follows. For a collision occurring between object 1 and object 2 in an isolated system, the total momentum of the two objects before the collision is equal to the total momentum of the two objects after the collision.