A giant "egg" explodes as part of a fireworks display. The egg is at rest before the explosion, and after the explosion, it breaks into two pieces, with piece B moving in the positive x direction. The masses of both pieces aretraveling in opposite directions.

The component of the momentum of piece B, pBx, f, is measured to be +500 kg?m/s after the explosion. Find the component of the momentum pAx, f of piece A after the explosion.