A boy A having a weight of 80 lb and a girl B having a weight of 70 lb stand motionless at the ends of the toboggan, which has a weight of 25 lb. A walks to B and stops, and both walk back together to the original position of A. Neglect friction between the toboggan and the snow.

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.