This is the formula for Kinetic Force. Doubling speed (velocity) quadruples energy, while doubling mass only doubles it.
So, in martial arts, sports, or collisions, speed is far more productive than mass for creating impactful force.
In Taijiquan (and Baguazhang), Fa Jing "issuing energy" is key to delivering penetrating strikes, even if the person isn't large.
Fa Jin is a refined skill to generate speed (and force) in a short space using the whole body (with a single point to a single point). Also consider, there are other factors involved than just striking power that uproots an opponent. Golden opportunities come and go very fast.
