Disregarding, at least for the moment, the question of whether time, space and energy are quantized, let’s imagine two quantum particles in a perfect vacuum.

Particle B is at rest. Particle A is launched at particle B at speed s. Assuming a direct, head-on collision between two inelastic particles and conservation of energy, we get a classic Newton’s cradle…

Particle B will be ejected at speed s. Particle A will be at rest in the position where it struck particle B.

Now, let’s further assume the speed of transfer of kinetic energy is c.

What happens when s > c? (Greater rate of speed than it takes to transfer its kinetic energy.)

My intuition wants to say that particle A will not come to rest because it did not transfer all its kinetic energy so B will be ejected at c, and A will continue its trajectory at s-c, but something feels missing…

Next, we have 3 particles. Particles B and C are at rest, and in contact. Particle A is launched at speed s for a direct hit. Again, we have Newton’s cradle. (Heisenberg’s cradle?)

Particle C gets ejected at speed s, particle B remains at rest, particle a comes to rest alongside particle B.

Again, what happens when s > c?

Finally, we have the inverse of above… C is at rest. B and A are traveling together. Perfect collision… This time, A comes to rest. B and C fly off into the sunset together.

What happens if B and A were traveling together at a speed greater than c when they struck particle C?