In a game of pool, the white cue ball hits the #9 ball and is deflected at a 35° angle to the original line of motion. What is the angle of deflection below the original line of motion for the #9 ball?
A)15°
B)35°
C)55°
D)75°
E)90°

Question

Quizplus · Accepted Answer

In a collision, the angles of deflection for the two balls should add up to 90° due to the conservation of momentum. If the cue ball is deflected at 35°, the #9 ball will be deflected at 55° (90° - 35°).

In a Game of Pool, the White Cue Ball Hits