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Block A of mass 2.0 kg and Block B of 8.0 kg are connected by a spring of spring constant 80 N/m and negligible mass. The system is being pulled to the right across a horizontal frictionless surface by a horizontal force of 4.0 N, with both blocks experiencing equal constant acceleration.
a) Calculate the force that the spring exerts on the 2.0 kg mass.
b) Calculate the extension of the spring.

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