One - which needs to be on the brake pedal!
Apart from the car's speed, the stopping distance will depend on the mass of the car, the condition of the brakes, the condition of the tyres - the air pressure and tread, the road condition, the driver's response.
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216 feet if you include reaction time.
62 feet
Varies with velocity and car model.
30 feet
At 50 mph, a car travels 73.33 feet every second.