this is ted barnstorm, ta. [laughter] and what i'm gonna do is i'm gonna hold this one up here, two meters high, and this one meter high, and i'm gonna drop them at the same time. if the resistance is proportional to velocity, they'll hit the ground at the same time because this one will fall twice as far as this, okay? let's try it and see. they did not hit at the same time. so hypothesis, no good. but let's suppose the resistance is compared-- stay right there, ted-- it's compared to the velocity square? all right? if it's proportional to the velocity square, then that means-- velocity square proportional to resistance proportional to the weight that means the velocity would be proportional to the square root of the weight. can you see that? if that's true, then the distance something falls would be equal to the square root of the weight. so if i had something twice as heavy, that greater distance it falls will be proportional to twice the square root of the weight times the time. but that's proportional to--

this is ted barnstorm, ta. [laughter] and what i'm gonna do is i'm gonna hold this one up here, two meters high, and this one meter high, and i'm gonna drop them at the same time. if the resistance is proportional to velocity, they'll hit the ground at the same time because this one will fall twice as far as this, okay? let's try it and see. they did not hit at the same time. so hypothesis, no good. but let's suppose the resistance is compared-- stay right there, ted-- it's compared to the velocity square? all right? if it's proportional to the velocity square, then that means-- velocity square proportional to resistance proportional to the weight that means the velocity would be proportional to the square root of the weight. can you see that? if that's true, then the distance something falls would be equal to the square root of the weight. so if i had something twice as heavy, that greater distance it falls will be proportional to twice the square root of the weight times the time. but that's proportional to--