To deal a maximum of damages you have to maximize your cinetic energy, that is to say, half of speed*speed*mass, (so high ramp and bowling/medecine ball are good) but not only, there is a rotation cinetic energy, so concrete is better than ice (even if it gives a little lower energy). Then you have to test the best direction for the ball to maximize the impact (if it is vertical, there is a maximum of energy but for a minimal number of boxes and if it is horizontal, there is an energy minimum but more hitten boxes).
 "Crunchball 3000"){kind=icon}
 "Strand"){kind=icon}
 "Ramp Lab"){kind=icon}