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`        A fast duck is flying (20i+40j)mi/h at the same altitude as a slow aeroplane flying with a velocity of (-80i+40j)mi/h.How fast and in what direction is the duck moving relative to the airplane.`
6 years ago

510 Points
```										velocity of duck = Vd = 20i + 40j
velocity of aeroplane Va = -80i + 40j
velocity of duck wrt plane = Vad = Vd - Va = 100 i             ans
cos@ = a.b/(ab)                               (@ is angle with duck is moving wrt plane) (a.b = dot product )
= -2/root5
@ = cos-1(-2/root5)                        ans

approve if u like my ans
```
6 years ago
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