The elevation at ground level is 0 feet. an elevator stars 90 feet bellow ground level. after traveling for 15 seconds the elevator is 20 feet bellow ground level. which stament describes the elevator rate of change in elevation during this 15 second a) the elevator traveled upward at a rate of 4 2/3 feet per second. b)the elevator travaled downward at a rate of 4 2/3 feet per second. c) the elevator traveled downward at a rate of 6 feet per second.