At clock time t = 7 sec, a ball rolling straight down a hill is moving at 6 m/s and is 47 m from the top of the hill.  It accelerates uniformly at a rate of .6 m/s/s until clock time t = 17 sec.  What is its velocity at this point and what is its average velocity during this time?  How far is it from the starting point at t = 17 sec?