Noninertial frame projectile. A device shoots a small ball horizontally with speed 0.253 m/s from height h = 0.832 m above an elevator floor. The ball lands at distance d from the base of the device directly below the ejection point. The vertical acceleration of the elevator can be controlled. What is the elevator's acceleration magnitude a if d is (a) 14.0 cm, (b) 20.0 cm, and (c) 7.50 cm? (a) Number A Units (b) Number i Units (c) Number i Units v