Physics for IGCSE & O level - Forces And Motion (Section 2 - No. 34)
What happens when two trolleys of equal mass collide head-on and stick together?
They stop moving.
They move in the direction of the faster trolley.
They continue moving at the same speed.
They move in the opposite direction.
Explanation
If the trolleys have equal mass and collide head-on with equal but opposite velocities, they will stop.