Question

An aircraft heading north lands at a speed of 250 km / h. Once the aircraft touches, it travels 750 m to reduce its speed to 22 km / h. a) Calculate the average acceleration of the aircraft during landing. b) How long does it take to slow down the aircraft?

Answer 1

Data: 

v = 250 km/h

u = 22 km/h

x = 750 m

Transform:

750m * (1km/1000m) = 0.75 km

a)

v² = u² + 2ax

(v^{2 -} u²)/ 2x = a

(22^{2 -} 250²)/ 2(0.75) = a

a = -41344

b)

v = u + at

(v - u)/ a = t

(22 - 250)/ (-41344) = t

t = 5.51*10^-3 s

Answer 2

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