A ball horizontally hits a wall at 5m/s and bounces back at -5m/s. The total momentum before is 1 kgm/s and after is -1 kgm/s. Is momentum conservation broken down in this example???

Question

A ball horizontally hits a wall at 5m/s and bounces back at -5m/s. The total momentum before is 1 kgm/s and after is -1 kgm/s. Is momentum conservation broken down in this example???
Reason???

PLEASE HELP

Damon · Answer

The earth moved a little :) In fact it moved forward just as much as it moved back when I thew the ball :)

Damon · Answer

and then caught it !