>>14321757Because the boy is pushing against the ball with lesser mass in the third pic at a constant force the third ball will move the fastest
One because it’s constantly experiencing acceleration along with friction meaning it should ideally never stop accelerating if the boys energy is infinite
Two because gravity alone will not make the ball on the inclined planes in the first two pics constantly move forward as the direction of the gravitational force will move down while friction counteracts any previous acceleration done
