A Boeing 747 aircraft has a landing speed of 72 m/s, and upon landing it is able to come to a stop in 2,000 m. Assuming constant deceleration, how long would it take for a Boeing 747 to come to a full stop?
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This sounds like it is a physics homework problem rather than a real life aviation problem, so I’ll answer it as such.
Let’s assume the rate of deceleration is constant. That would mean the average speed from the moment of touchdown at 72 m/s to the moment of stop at 0 m/s is 36 m/s. So now the question is “How long does it take to travel 2,000 m at 36 m/s?”
t * 36 m/s = 2,000 m. So t = 2,000/36. t = 55.5555555… We’ll round that to 56 seconds.
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This sounds like it is a physics homework problem rather than a real life aviation problem, so I’ll answer it as such.
Let’s assume the rate of deceleration is constant. That would mean the average speed from the moment of touchdown at 72 m/s to the moment of stop at 0 m/s is 36 m/s. So now the question is “How long does it take to travel 2,000 m at 36 m/s?”
t * 36 m/s = 2,000 m. So t = 2,000/36. t = 55.5555555… We’ll round that to 56 seconds