Under favorable circumstances, how long does it take for a vehicle going 50 mph to stop?

Answer: D — about 229 ft

Vehicles typically require around 4 times the stopping distance at 50 mph as compared to 25 mph due to the increase in speed. This means that while 50 ft may be an appropriate stopping distance at 25 mph, it would take around 4 times longer to stop a vehicle going 50 mph, which would be approximately 200 ft. Therefore, option A is incorrect. Option B is also incorrect as it is too low of a distance. Option C is closer to the correct answer but still underestimates the time it takes for a vehicle to stop at 50 mph. Option D is the most accurate answer, as it takes into account the increased stopping distance needed at higher speeds.