Answer this question: One 7.0 kg bowling ball is lifted to a storage shelf 1.0 m above the floor. A second 7.0 kg ball is lifted to a storage shelf 2.0 m above the floor. Which of the following best explains why the measured force of gravity on each ball is nearly identical?
Choose from:
 + The final potential energy of each ball increased..
 + The amount of work required to lift each ball is identical..
 + The distance of each ball from Earth's center of mass is almost identical..
 + The gravitational force of each ball on the other cancels out the force of Earth's gravity... Answer: