- "Physics 101. The faster an object moves, the more mass it attains. At lightspeed, my fist hits like a white dwarf star."
- ― The Flash, DC Comics
The power to enhance physical attacks by moving at great speeds, gaining momentum. Technique of Enhanced Speed, Supernatural Speed and Absolute Speed. Variation of Enhanced Strike.
- High-Speed Strike
- Infinite Mass Speed/Strike
- Quick Strike
User can acquire the relativistic mass by traveling at great speeds, and hit blows of tremendous force.
- Speed does not necessarily mean the strikes power will increase.
Sonic the Hedgehog (Sonic the Hedgehog) using the momentum of his speed, Sonic can land devastating blows to solid steel and other durable forms of matter.
Shadow the Hedgehog (Sonic the Hedgehog)can use his incredible speed to boost his strikes to devastating levels, in the same manner as his rival Sonic.
Knuckles the Echidna (Sonic the Hedgehog)
Yaya's (Unbreakable Machine-Doll) super powerful punch.
Brook (One Piece) using his signature speed strike technique Hanuata Sancho: Yahazu Giri.
Bellamy (One Piece) using his Bane Bane no Mi spring powers to boost his punching strength with the momentum.
Gear Second involves Luffy (One Piece) increasing the flow of blood in his body. By doing so he can then use the Rokushiki technique, Soru and strike his opponents at very high speed.
Borsalino (One Piece) using his Pika Pika no Mi to increase the speed of his kick to build relativistic mass.
The Jet Dials that Gedatsu (One Piece) has attached to his elbows allow him to strike his enemies at very high speeds. The only downside is the impact creates holes in his clothing.
Whenever Cavendish's (One Piece) alter-ego Hakuba takes over, he is able to slice his opponents at an incredibly high speed.
The Flash (DC Comics) demonstrates.