2. Great America has recently designed a roller coaster as seen below. The mass of the cart is 100 kg and the track has one hill followed by a circular loop with a 15 meter radius. (a)What minimum speed must the cart move to make it through the top of the loop? (b) The cart starts at rest on top of the hill before speeding through the loop. How tall must they make the hill so that the roller coaster has enough PE to make it through the loop.
