steel ball traveling at 6 m/s hits a stationary line of three steel balls. Which statement is true if the collision is perfectly elastic?

Question

a) The original ball stops and a single ball moves to the right at 6 m/s.
b) The original ball stops and the three balls move to the right at 2 m/s.
c) The original ball bounces back at -6 m/s and one ball moves to the right at +6 m/s.
d) All four balls move to the right at 1.5 m/s
e) The original ball bounces back at -3 m/s and one ball moves to the right at +3 m/s.

Answer 1

c) The original ball bounces back at -6 m/s and one ball moves to the right at +6 m/s.