The second roller coaster we will create will have a loop! it is starting to get more exciting and looks like a real roller coaster! start at 140 cm again and have the peak of the loop 1 m away from the surface. you will need to use more tape this time to secure the tubing. drop the marble down the tubing. if the marble completed the loop, make it higher to find the maximum height. if the marble did not complete the loop, lower the loop unit you find the maximum height. if you cannot get the marble to complete the loop, your design may not be stable enough. if this is the case, use tape to make your design more taut. in order for the marble to complete the loop, it must have a non zero velocity at the top of the look. derive an equation for the minimum velocity in the loop. show all of your (hint: refer back to module 5 on centripetal force and acceleration)