Why would a high speed collision cause more damage than a low speed collision?

If you have more speed you have more momentum and if you have more momentum then you force in pounds or grams.

Explain why a high speed collision between two cars would cause more damage than a low-speed collision between the same two cars. The more mass and speed and object has, the greater its kinetic energy ... At lower speeds, the kinetic energy is less, so the impact would be less and there would be less damage.