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hermy
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Homework Statement
A plane flying at a constant velocity v (parallel to x-axis) at a height h = 8 km is being tracked by a radar located at origin. if the angle A is decreasing at the rate of 0.025 rad/s, the velocity of the plane when A = 60 degrees is: (A is the angle made by the position vector of plane with the x-axis)
a) 1440 km/h
b) 960 km/h
c) 1920 km/h
d) 480 m/h
Homework Equations
vt = h cot A
differentiating w.r.t t (time):
v = h cosec2 A (0.025) -------eqn 1
= 0.27 km/h
The Attempt at a Solution
the answer is nowhere near what one would expect. also, if v is consatant then how can it depend on A? (eqn 1) Where am i going wrong?