Answer:
R = 0.1 ohms
Step-by-step explanation:
It is given that,
Voltage of the battery, V = 12.5 V
Current flowing in the car's starter, I = 125 A
We need to find the effective resistance of a car's starter. It can be calculated using Ohm's law. Let R is the resistance.

So, the resistance of the car's starter is 0.1 ohms.