- #1
Bennyp85
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Homework Statement
A water tanker on a railroad has a plug that is opened.
The tanker is moving at 5.0m/s
Will the tanker speed up when the water is being drained?
Homework Equations
m1*v1 = m2*v2
The Attempt at a Solution
My original thought was yes it will speed up
But after looking at the answer it says that the water being drained is moving horizontally at 5.0m/s, so there is no change in momentum. So no change in speed.
Why is there no change in momentum? Isn't m1 decreasing?
Is it something to do with not being an isolated system?