An aeroplane touches down (land) at a speed of 180km/h stops after covering a runway of 1km. Calculate(a) the retardation(b) the time in which the plane comes to rest.

initial velocity u = 180 km/h = 50 m/sdistance travelled s = 1 km = 1000 m final velocity is zero, v = 0v - u = ata = -50/ts = ut + 12at21000 = 50t -50t/2t = 40 sa = -50/40 = - 1.25 m/s2 which is the retardation

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