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lifewmylilweeb:
A car with a mass of 1.1 × 103 kilograms hits a stationary truck with a mass of 2.3 × 103 kilograms from the rear end. The initial velocity of the car is +22.0 meters/second. After the collision the velocity of the car is -11.0 meters/second. What is the velocity of the truck after this elastic collision? A. +13 meters/second B. +20 meters/second C. +15.7 meters/second D. +7.5 meters/second E. +9.8 meters/second
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Brainster:
My educated guess is A
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