Two objects colliding & sticking together, what is their final speed?

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SUMMARY

In the discussion, two freight cars, each with a mass of 2.5 x 105 kg, collide in a completely inelastic collision. One car is moving at 3.4 m/s while the other is at rest. Using the conservation of momentum formula, m1v1 + m2v2 = (m1 + m2)v', the final speed (v') of the combined mass after the collision is calculated to be 1.7 m/s.

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Homework Statement



Two freight cars, each with a mass of 2.5 multiplied by 10^5 kg, collide and stick together.
One was initially moving at 3.4 m/s and the other was at rest. What is their final speed?


Homework Equations


m(vf-vi)


The Attempt at a Solution


(2.5*10^5)(0-3.4)= -850,000
= -8.5 * 10^5 m/s
 
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The main thing you can use in the problem is conservation of momentum:

m1v1+m2v2=(m1+m2)v'

This equality is a result of the completely inelastic collision. The question asks you to solve for v'.
 

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