he motor in a toy car is powered by four batteries in series, which produce a total emf of 7.4 V. The motor draws 2.9 A and develops a 2.1 V back emf at normal speed. Each battery has a 0.16 Ω internal resistance. What is the resistance of the motor in Ω?

Physics for Scientists and Engineers: Foundations and Connections
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Chapter29: Direct Current (dc) Circuits
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Problem 12:   The motor in a toy car is powered by four batteries in series, which produce a total emf of 7.4 V. The motor draws 2.9 A and develops a 2.1 V back emf at normal speed. Each battery has a 0.16 Ω internal resistance.

What is the resistance of the motor in Ω? 

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