Question

Two identical billiard balls are rolling toward each other at the same speed. What will be true after they collide head-on?

They will both stop rolling immediately after the collision
One ball will stop rolling as the other bounces backward at a slower speed.
They will both bounce back at a faster speed after the collision.
They will both bounce back at the same speed they had before the collision
Please help

Answer 1

They will both bounce back at the same speed they had before the collision

Step-by-step explanation:

Assuming an elastic collision, kinetic energy will be conserved. Therefore, the billiard balls will have the same speed after the collision as before the collision.