hour, 3,600 feet of track. 63-second ride. so how do they do it? this computer drives the 1,500 horsepower motor, speeds it up or slows it down because we want to keep a constant velocity. reporter: what s truly amazing, the only power comes from this 1,500 horsepower motoring cable. this cable pulls that 16-ton train from 0 to 26 feet per second. and you are launched. once it s released, it s all gravity. reporter: a marvel of modern engineering that will make your stomach climb into your throat. but miraculously have you begging for more. oh, my word. mama. you like roller coasters? crazy. the tallest roller coaster in the world and the fastest in north america is the kingda ka at six flags great adventure in