Question

Two billiard balls of equal mass are on a level, frictionless surface. The first ball is moving and collides with the second ball, which was stationary. After the collision, both balls are moving. What is a possible speed for the first ball after the collision?
A) twice its original speed
B) one-half its original speed
C) the same as its original speed
D) one and one-half times its original speed

Answer 1

B. One-half of its original speed