Cite the distance with a given boolit,when they start to bounce off...instead of "stick".
Impact velocity/projectile construction,matters far more than "energy". An underhand toss of a grapefruit to your peabrain,might only straighten your crossed eyes...but an icepick in your ear with like velocity,will give you the cure. That despite your frilly grapefruit "energy" notion(s).
Smarts ain't your gig,if only obviously..................
