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The lift force acting on the wing of an aeroplane is 2275N . If the area of the wing is 5m2 and velocity of air on the lower surface of the wing is 30m/s , velocity of air on the upper surface of the wing is (density of air is 1.3kgm3 )

a
20 m/s
b
25 m/s
c
35 m/s
d
40 m/s

detailed solution

Correct option is D

F=ρA2(v22−v12)                          2275=1.3×52[v22−(30)2] v22−900=22753.25=700                     v22=1600⇒v2=40ms−1

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