When a car's starter is in use, it draws a large current. The car's lights draw much less current. As a certain car is starting, the current through the battery is 55.8 A and the potential difference across the battery terminals is 8.37 V. When only the car's lights are used, the current through the battery is 2.20 A and the terminal potential difference is 12.5 V. Find the battery's emf. Find the internal resistance.

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