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A runaway rail cart with mass 5000kg traveling on a horizontal frictionless track with 100ms-1velocity collides...

A runaway rail cart with mass 5000kg traveling on a horizontal frictionless track with 100ms-1velocity collides with a similar cart at rest but free to move(no brakes on). Upon the collision, the two carts attached together (coalesce) and travel together. Calculate the final velocity of the two carts system.

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