What Is the Final Velocity After Two Freight Cars Collide and Interlock?

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To find the final velocity after two freight cars collide and interlock, the principle of conservation of momentum is applied. The initial momentum is calculated using the mass and velocity of the moving freight car, while the stationary car contributes zero momentum. After the collision, the total mass of the interlocked cars is the sum of their individual masses. The final velocity can be determined by equating the total momentum before and after the collision. This approach clarifies the relationship between mass, velocity, and momentum in inelastic collisions.
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Homework Statement



A 6500 kg freight car traveling at 2.5 m/s collides with an 8000 kg stationary freight car if they interlock upon collision find their velocity

Homework Equations



M1 = 6500
M2 = 8000 kg
V1 = 2.5 m/s
V2= ?

i think the equation is p before = p after but I am confused how i can use it

The Attempt at a Solution



not sure how to use the equation
 
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Linear Momentum is mass x velocity. So before collision, what is the total momentum? After collision, the cars lock together, so what is the new mass and hence the final momentum?
 

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