[bentcorner]

I agree. If I jump up and down and impact the earth with my feet it's quite harmless. I suspect above some lower bound it doesn't matter how much something weighs, it's all about how fast something hits you (because it's mostly you that's being accelerated).

Although the weight (and correspondingly, the size) of a car does play into sight lines, maneuverability and how fast the car can decelerate.