Calculate the resultant velocity of an airplane that normally flies at 200 km/hr if it encounters a 50 km/hr tailwind. if it encounters a 50 km/hr headwind.

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d

explanation:

v=uf/(u-f)

= 5.10/(5-10) convex lens has positive focal length

=50/-5

=-10 cm (formed at other side)

d is the correct answer

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