It will be a little bit less because of evaporation i learned that in third grade and your in high school that is sad
The final velocity of the two pucks is -5 m/s
Explanation:
We can solve the problem by using the law of conservation of momentum.
In fact, in absence of external force, the total momentum of the two pucks before and after the collision must be conserved - so we can write:

where
is the mass of each puck
is the initial velocity of the 1st puck
is the initial velocity of the 2nd puck
v is the final velocity of the two pucks sticking together
Re-arranging the equation and solving for v, we find:

Learn more about momentum:
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Answer:
Significant Other
Explanation:
that comes to mind when I see that
To me, that sounds like the "Law of Conservation of Energy".