It's not quite so simple, Dimorphos turned out to have a lot of loose rubble, so the impact created a lot of ejecta going the opposite direction of the site of impact, which means you get a greater pushing effect.
Imagine tossing a sticky ball at metal cube in space.
The ball will stick to the cube and they'll float away at a slower velocity than what the ball originally had
If you toss a rubber bouncy ball of the same mass at the same velocity, it'll bounce away from the metal cube, and come flying back at you while the cube will float away faster than if you used the sticky ball
Second_Sol t1_jakpukk wrote
Reply to comment by Embite in NASA’s DART data validates kinetic impact as planetary defense method | DART altered the orbit of the asteroid moonlet Dimorphos by 33 minutes by mepper
It's not quite so simple, Dimorphos turned out to have a lot of loose rubble, so the impact created a lot of ejecta going the opposite direction of the site of impact, which means you get a greater pushing effect.
Imagine tossing a sticky ball at metal cube in space.
The ball will stick to the cube and they'll float away at a slower velocity than what the ball originally had
If you toss a rubber bouncy ball of the same mass at the same velocity, it'll bounce away from the metal cube, and come flying back at you while the cube will float away faster than if you used the sticky ball