Answer:
By the range of the headlight of a car, we mean the maximum distance(s) up to which an obstacle on the road can be seen by the driver in the darkness. The driver has to stop the car before it reaches the obstacle. The retarding force acting on the car is constant. If, on applying brakes, the retardation in the car is a, then to stop the car within distance s, the speed \[\upsilon \] of the car should be less than\[\sqrt{2\text{a s}}\]. Thus the speed of the car depends on the range (s) of the headlight.
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