What is the speed of the 30 ton car relative to the ground?

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computergenious

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A 30 ton rail car and a 70ton rail car, initially at rest, are connected together with a giant but massless compressed spring between them. When released, the 30ton car is pushed away at a speed of 4.6 m/s relative to the 70ton car. What is the speed of the 30ton car relative to the ground?
 
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