Answer for Q2):
Let the horizontal distance of the plane from radar be x.
From the figure,
tan
=8000/x
Now differentiate this wrt t,
So sec
2 *d
/dt= (-8000/(x
2))dx/dt
When
=60
0 x=8000/
3 , d
/dt= -0.025rad/s and dx/dt=v
Substitute the values u will get v=266.67m/s
or v=960km/hr
Moderation Team
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