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Please provide me the correct answer of the given question

Question- a 1015-kg compact car is traveling north at 15 m/s when it collides with a 2102-kg truck traveling east at 10 m/s. All occupants are wearing seat belts and there are no injuries, but the two vehicles are thoroughly tangled and move away from the impact point as one mass.

Part 1- The insurance adjuster has asked you to find the velocity of the wreckage just after impact. What do you tell him?

I need help to evaluate the right answer of the above question.

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