Question

an aeroplane touches down (land) at a speed of 180 km per hour and stop after covering a Runway of 1 km to stop calculate first the retardation and second the time in which the plane comes to rest​

Answer 1

Answer:

where, v = final velocity of the aeroplane, u = initial velocity of the aeroplane, a = retardation, S = distance, t = time. Thus the retardation of the aeroplane is 16200 km/hr². Thus, the time required for the aeroplane to stop is 1/90 hr. 1/90 hr = (1 x 3600)/90 sec = 40 sec.