A book with a mass of 0.30 kg falls 2 m from a shelf to the floor. This event is described by the work-energy theorem: W equals F d equals 1 half m v subscript 2 squared minus 1 half m v subscript 1 squared Why is this enough information to calculate the speed at which the book hits the floor? A. The mass of the book, m, and distance, d, are stated. F is the weight of the book in milligrams. v1 is the initial velocity and v2 is the final velocity. The final velocity and the initial velocities are the only unknown quantities. B. The mass of the book, m, and distance, d, are stated. F is the weight of the book in milligrams. v1 is the initial velocity and v2 is the final velocity. The final velocity is the only unknown quantity. C. The mass of the book, m, and distance, d, are stated. F is the weight of the book in milligrams. v1 is the final velocity and v2 is the initial velocity. The final velocity and the initial velocities are the only unknown quantities. D. The mass of the book, m, and distance, d, are