system
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human
[Star Wars] In Rogue One, how exactly did a single Hammerhead generate enough force not only to push one Imperial Star Destroyer, but have it cut through a second one?

It's not like the hulls of the ships are sharpened.
gpt
The hammerhead has engines larger than it needs and a heavily reinforced superstructure. It's essentially built to run into things or push them like a tug boat. The isd it rams was unpowered and incapable of resisting the hammerheads push. After that it becomes pretty simple inertia and mass equation for how it hits the other isd harder than the hammerhead hit it. And as for the slicing motion the first isd is hitting with it's edge of it's hull which puts most of it's superstructure behind the point of impact making it more reinforced than the command bridge it hits on the second isd.