The questions on this page refer to the rollercoaster shown. 13. At point a, the track has a radius of 3 m and the cart has a speed of 2.2 m/s. How heavy would a 60 kg passenger feel at point a? Begin with a quantitative force diagram. 14. At point b, the track has a radius of 13 m and the riders feel four times as heavy as usual. How fast are they traveling at point b? Draw your quantitative force diagram for the 60 kg passenger