Airplanes A and B are flying with constant velocity in the same vertical plane at angles 30° and 60° with respect to the horizontal respectively as shown in figure. The speed of A is 100 
ms –1 . At time t = 0s, an observer in A finds B at a distance of 500m. This observer sees B moving with a constant velocity perpendicular to the line of motion of A. If at t = t 0 , A just escapes being hit by B, t 0 in seconds is:
Text Solution
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(5)
Sol.
For relative motion perpendicular to line of motion of A
V A = 100 
= V B Cos 30º
⇒ V B = 100 m/s
t 0 = 
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