Answer: assuming that the billiard balls are of identical weight the impacted billiard ball will move forward at around 0.5m/s (not considering energy conservation). The ball impacting the 2nd one would stop because most of its Kinetic energy would have been transferred into the not moving ball.
Explanation: hope this helps!
D. Unbalanced forces are acting on it.
hope this helped
Buddy, I think you need to evaluate your question and fix it. Because it's not making any sense, whatsoever.