Question 18. A cart of mass m begins at rest, and is connected to a spring of spring constant k which is compressed a distance x away from equilibrium. It is released, rolling to the right with no friction. It encounters an upward curve in the track, and reaches a maximum height h above its starting position. What is h, in terms of the variables given, and g, the acceleration due to gravity? kx mg Initial k 00000 m O 2kx2 mg kx 2mg 2kx mg kx 2mg h Final