At NASA's Zero Gravity Research Facility in Cleveland, Ohio, experimental payloads fall freely from rest in an evacuated vertical shaft through a distance of 132 m.(a) If a particular payload has a mass of 22 kg, what is its potential energy relative to the bottom of the shaft? J (b) How fast will the payload be traveling when it reaches the bottom of the shaft? m/s Convert your answer to mph for a comparison to highway speeds.