3 ms·

Nope - they would bounce.

• treis 4y ago
  If they bounce then they interact with some force besides gravity
  • thriftwy 4y ago
    No, I mean they will run through one another and continue in the directions they have flown previously, but now slowing down rather than accelerating, and would repeat that loop endlessly. Particles are point-like, they can't "collide".