You have written a collision-detection algorithm to find out whether a ball hits a wall.
However, the ball sometimes passes completely through the wall and no collision is
detected.
Which two reasons can explain this? (Choose two.)

A.
High ball velocity

B.
Low polygon count

C.
low frame rate

D.
Low ball velocity

Explanation:
http://www.euclideanspace.com/threed/animation/collisiondetect/