A point mass slides with speed v on a frictionless horizontal surface between two fixed parallel walls, initially a distance L apart. It bounces between the walls perfectly elastically. You move one of the walls towards the other by a distance 0.01 \mathrm{~L}, with speed 0.0001 \mathrm{v}. What is the final speed of the point mass?
Answer Choices
A. 1.001 v
B. 1.002 v
C. 1.005 v
D. 1.01 v \leftarrow CORRECT
E. 1.02 v