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Question
An aircraft lands on a runway at a velocity of 40 m s-1 and brakes to a halt in a distance of 860 m. Calculate
a) the breaking time
b) the deceleration of the aircraft
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General Physics
7 years
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Answer ( 1 )
For a single period with uniform acceleration, you can find average velocity by doing the average of the starting and ending velocity.
Vavg = (40 + 0)/2 = 20 m/s
Displacement = Vavg * time
Since aircraft doesn’t switch direction, displacement is also distance traveled.
860 m = 20 m/s * t
t = 43 s
Acceleration = change in velocity / time = -40 / 43 = -0.93 m/s^2