This means if you double the speed, the force of the collision will be four times greater.

Here's why:

* Kinetic Energy: The energy of motion is called kinetic energy. It's calculated as 1/2 * mass * velocity².

* Force and Energy: Force is related to the change in energy. If you double the speed, you quadruple the kinetic energy (because of the square in the equation).

* Result: Since the energy is four times greater, the force of impact (which is related to the change in energy) will also be four times greater.