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A railway wagon with a mass of 20 tonnes is moving along a level track at 10 km/h when it collides and couples together with a second wagon with a mass of 25 tonnes moving in the same direction at 5km/h. If the two wagons couple together after the impact, what would be their common velocity?

 Jan 16, 2017

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 #1
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Assuming momentum is conserved then:

 

m1v1 + m2v2 = (m1 + m2)vf

 

vf = (m1v1 + m2v2)/(m1 + m2)     Plug your numbers in here.

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 Jan 16, 2017
 #2
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Alan, is the first part timesed together before it its added: m1v1 + m2v2 

 Jan 16, 2017
 #3
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Yes.    m1*v1 + m2*v2

Alan  Jan 16, 2017

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