Question

A bird is sitting on the top of a 80m high tree from a point on the ground the angle of elevation of the bird is 45degree .

Answer 1

Answer:

I can understand the question because you haven't written

Answer 2

Answer:

Speed = 40(√3−1)m/s

Step-by-step explanation:

tan45∘=BC/AC

1=BC/80

BC=80m

tan30∘=BC+CE/DE

1/√3= 80/80+x

80+x=80√3

x=80√3−80

x=80(√3−1)cm

The bird travelled 80(√3−1)m

Speed of bird = Time/Distance

=280(√3−1)

=AO(√3−1)m/s

∴ Speed = 40(√3−1)m/s