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**1. Homework Statement**

"A truck weighs four times as much as a car, If the truck coasts into the car at 12 km/h and they stick together, what is their final velocity."

**2. Homework Equations**

Change in momentum a = change in momentum b

OR

m1v1 = m2v2

OR

(delta)P system = 0

**3. The Attempt at a Solution**

I HAVE NO IDEA. SRSLY.