Starting from rest, Superman flies upward with an acceleration of 125 m/s over 21 meters vhen he is exposed to kryptonite (after which his powers cease functioning, and he's only nder the influence of gravity.) (a) How fast was Superman flying when he was exposed to kryptonite? (b) How high did Superman get before he began falling? (c) How much time elapses between when Superman reaches his highest point and when he hits the ground? (d) How fast was Superman going when he hit the ground?

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