Two books are located 1 m above the surface of the Earth. The first has a mass of 2 kg; the second has a mass of 1 kg. Which statement about the pull of Earth's gravity is true?
A. The force of Earth's gravity on the 1-kg book is stronger than the force of Earth's gravity on the 2-kg book.
B. The force of Earth's gravity on the 2-kg book is stronger than the force of Earth's gravity on the 1-kg book.
C. The force of Earth's gravity is the same on both books, because when they're dropped, they'll both accelerate at 9.8 m/s2.
D. The force of Earth's gravity is the same on both books, because the two books are both 1.0 m above the ground.