You may also experiment with the lighting of the book. You may want to select several books of different colors.
Remember, books tend to fly open when thrown, so you may want to rig up a temporary way to keep it closed. If the camera is not going to linger on the book, you may use clear tape.
It may not be necessary to even show the impact on the face. Many times it is much more effective to have the audience imagine the impact. This is an old film technique, and very powerful. The imagination of the viewer will always fill in the gaps. You could cut directly to the bleeding wounded face.
You may wish, during filming of the face in the immediate post-impact shot, to place the camera in motion. For example, you could have the camera open the shot on the left side of the subject's face, and move to the right while the subject slowly looks to the left, so that face and camera are moving in opposite directions. This lends artistic depth to the scene, and if you really want to make your point, you may have the light changing on the face during the shot as well, which would give you 3 moving elements- face, camera, and light. This would allow you to explore the depth of feeling and reaction of the impact victim.
Just a standard shot of the face post-impact would be rather shallow and not grab your audience's attention to you as a talented director.
Filmmaking is an art, and here is your chance to really shine... here is you chance to demonstrate the depth of your talent and your nobility in communication.... to show that you are not merely a snapshot-taker, but rather a sensitive thinking mind, capable of becoming fully professional.