heavier slower truck colliding with a lighter fast

heavier slower truck colliding with a lighter faster car. Here u1 represents the velocity just before the collision and v represents the velocity just after the collision.

a) The velocity, v, just after the collision is determined by fitting a line to the data points some time after the collision. Why?

b) What is happening to the cart as time goes by in this sample trace? Recall you will be pushing the both carts with your hands, they will collide, and then they will stick together and move off, What part of the graph corresponds to you pushing? to cart moving before collision? to the collision? to the two carts moving together after the collision?

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