Amass m = 76 kg slides on a frictionless track that has a drop, followed by a loop-the-loop with radius r = 19.4 m and finally a flat straight section at the same height as the center of the loop (19.4 m off the ground). since the mass would not make it around the loop if released from the height of the top of the loop (do you know why? ) it must be released above the top of the loop-the-loop height. (assume the mass never leaves the smooth track at any point on its path.)