Force That Keeps an Object Moving
Puzzle 7 of Same Letter at Both Ends Easy Pack
Question is: Force That Keeps an Object Moving
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.