Areas are depicted on aeronautical charts with an "a" followed by a number (e. g., a-211) to inform nonparticipating pilots of areas that may contain a high volume of pilot training or an unusual type of aerial activity. pilots should exercise caution in these areas.

Which statement is true? a) the work done to lift an object 6 meters is greater than the gravitational potential energy it gains. b) the work required to push an object is less than the work required to pull an object the same distance. c) the work required to raise an object to a height is equal to the gravitational potential energy the object gains. d) the work done against gravity to lift an object straight up is greater than the work required to roll it up a ramp.