Two airplanes leave an airport at the same time. The velocity of the first airplane is
650 m/h at a heading of 28.7
◦
. The velocity
of the second is 610 m/h at a heading of 90◦
.
How far apart are they after 1.8 h?
Answer in units of m.

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explanation:

d

explanation:

v=uf/(u-f)

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

=50/-5

=-10 cm (formed at other side)