Question

A bird is flying along eastward direction with a speed
10 m/s. An eagle, trying to prey on the bird, is flying
along northward direction with a speed 20 m/s. The
speed of the bird as observed by the eagle will be.
(1) 1055 m/s
(2) 2015 m/s
(3) 10 m/s
(4) 30 m/s​

Answer 1

Answer:

30 m/s

Explanation:

apply the relative velocity concept

Answer 2

Answer:

$V=10\sqrt{5}\ m/s$

Explanation:

Given that

Speed of the bird u = 10 i m/s

Speed of the eagle v= 20 j m/s

Now from the diagram

The speed of the bird with respect to the eagle(V) = u - v

V= u - v

V =  10 i - 20 j m/s

The magnitude of the speed V

$V=\sqrt{v^2+u^2}$

Now by putting the values of u and v we get

$V=\sqrt{10^2+20^2}$

$V=10\sqrt{5}\ m/s$

In the given option ,all option is not matching the correct answer.So the new option e is added.

e) $V=10\sqrt{5}\ m/s$