A toy drone emits a sound of constant frequency $800Hz$. The speed of the sound in the air is $330{\text{ }}m{\text{ }}{s^{ - 1}}$.
The drone moves along a straight path directly towards an observer and then continues in a straight line directly away from the observer. The speed of the drone is constant.
What is the velocity of the drone when the frequency of the sound heard by the observer is $850Hz$?
1 )
A
2 )
B
C
4 )
D
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