[-/2 Points] DETAILS OSCOLPHYS2016ACC 2.7.P.047. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER (a) Calculate the height (in m) of a cliff if it takes 2.29 s for a rock to hit the ground when it is thrown straight up from the cliff with an initial velocity of 8.13 m/s. (Enter a number.) m (b) How long (in s) would it take to reach the ground if it is thrown straight down with the same speed? (Enter a number.) S