Question 5. (9 marks) A solid steel sphere (radius r, mass m) is held against a spring (with spring constant k), which is compressed by Ar. The sphere is at the bottom of a slope. When the spring is released, the sphere rolls up the slope without slipping. a. Find the speed of the sphere when it is h higher than its starting point, in terms of m, k, (7) Ax and h. b. Check your answer to (a) by using dimensional analysis. Show your working. (2) [9]