An aeroplaIn aeroplane lands with a velocity of 270 km/hr and comes to

1.	An aeroplaIn aeroplane lands with a velocity of 270 km/hr and comes to rest after covering a run way o1000 m. Calculate the retardation of aeroplaneA) 2.8125m/s2B ) 3.8125 m/s C) 4.2185 m/s D) 3.2185 m/s2
Answer» Initial velocity, u = 270km/h or 75m/s Final velocity, V = 0 km/h or 0m/s { because the plane comes to rest } Distance COVERED, s = 1000m We know, ➜ 2as = v² - u² ☛ 2×a×1000 = 0 - 75² ☛ 2000a = -5625 ☛ a = -5625/2000 ☛ a = -2.8125 Hence, The RETARDATION of the plane is 2.8125 m/s²

An aeroplaIn aeroplane lands with a velocity of 270 km/hr and comes to rest after covering a run way o1000 m. Calculate the retardation of aeroplaneA) 2.8125m/s2B ) 3.8125 m/s C) 4.2185 m/s D) 3.2185 m/s2

Answer»

Initial velocity, u = 270km/h or 75m/s

Final velocity, V = 0 km/h or 0m/s { because the plane comes to rest }

Distance COVERED, s = 1000m

We know,

➜ 2as = v² - u²

☛ 2×a×1000 = 0 - 75²

☛ 2000a = -5625

☛ a = -5625/2000

☛ a = -2.8125

Hence, The RETARDATION of the plane is 2.8125 m/s²