A toy train is pushed forward and released at x 0 = 2.0 m with a speed

Question:

A toy train is pushed forward and released at x₀ = 2.0 m with a speed of 2.0 m/s. It rolls at a steady speed for 2.0 s, then one wheel begins to stick. The train comes to a stop 6.0 m from the point at which it was released. What is the magnitude of the train’s acceleration after its wheel begins to stick?

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