Two balls colliding while both are in motion is highly unusual—unless you're at Topgolf—but it does happen. Perhaps the most ...

Two particles with different masses collide elastically. Show that in the centre-of-mass reference frame the final speeds of the two balls are the same as before the collision. In the centre-of-mass ...

Collisions of these cold atoms can sometimes ... balls," the photon was like the cue ball that smashed into two other balls (the atoms) simultaneously, sending them flying off the table.