7. A small pebble thrown vertically upward om the surface of the planet Ork reaches a height of s = 36t 0.6t2 miles in t minutes. a} Find the pebble's velocity and acceleration as lnctions of time. (The acceleration in this case is the acceleration of gravity on Ork.) b) How long did it take the pebble to reach its highest point? c} How high did the pebble go? (1) When did the pebble reach half its maximum height on the way up? On the way down? 6} How long was the pebble aloft