Brady is setting up a track for his toy car to race down. The track starts at the top of a staircase that is 3.60 meters tall. At the bottom of the staircase, the car runs through a horizontal loop. The toy car has a mass of 41.5 grams. Assume no friction is present. 17. At the top of the staircase, how much gravitational potential energy does the toy car have? 18. Upon reaching the bottom of the staircase, what is the velocity of the car? 19. The horizontal loop at the bottom of the staircase has a radius of 0.71 m. What is the centripetal force that the track exerts on the car when it is in the loop? (Hint: use the velocity value that you found in question 18)