Answer:
The two skaters will move with a common speed of 1.19 m/s.
Explanation:
Given that,
Mass of Alex, 
Initial velocity of Alex, 
Mass of Barbara, 
Initial velocity of Barbara, 
After the collision, the two skaters move together at a common velocity. Let V is the common velocity. Using the conservation of momentum as :

Magnitude of final velocity:

So, the two skaters will move with a common speed of 1.19 m/s.
Explanation: Evaporation happens when a liquid substance becomes a gas. When water is heated, it evaporates. The molecules move and vibrate so quickly that they escape into the atmosphere as molecules of water vapor (Dunn,1993).
Electrons flow from the positive end of a source towards the negative end