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Q. The two springs in the figure below each have a spring constant of 10 N/m. They are stretched by 1.2 cm when a current passes through the wire. How big is the current?

Q. A hockey puck is sliding across a frozen pond with an initial speed of 9.7 ms. It comes to rest after sliding a distance of 44.0 m. What is the coefficient of kinetic friction between the puck and the ice?

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