Speed Built Up Over Time That Gives Impetus
This page is the CodyCross answer for the clue below from Spa Time, Group 807, Puzzle 4 (Nano Needling).
Question is: Speed Built Up Over Time That Gives Impetus
and the answer is: MOMENTUM
Word Meaning:
MOMENTUM — (physics) Of a body in motion: the tendency of a body to maintain its inertial motion; the product of its mass and velocity, or the vector sum of the products of its masses and velocities.
Definitions from Wiktionary.