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Solve the all parts of given question:

Question: A 2000-kg truck is sitting at rest (in neutral) when it is rear-ended by a 1000-kg car going 20m/s .After the collision, the two vehicles stick together.

Part A: What is the final speed of the car-truck combination?

Part B: What is the kinetic energy of the two-vehicle system before the collision?

Part C: What is the kinetic energy of the system after the collision?

Part D: Based on the results of the previous parts, what can you conclude about which type of collision this is?

Part E: Calculate the coefficient of restitution for this collision.

I want help to determine the final speed of the car-truck combination.

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