Two railway trucks, A and B with masses 7m kg and 3m kg respectively, are travelling towards each other on a smooth horizonatl track.
Both trucks are travelling at 3m/s when they collide.
The trucks couple together in the collision and then move together as a single body
i)find the velocity opf the combined trucks immediately after the collision
ii)find in terms of m the magnitude of the impulse A ON B in the collision
Immediately after the collision the truck experiences a braking force which brings them to rest in 24metres.
ii)fidn the magnitude of the braking force.