An enemy plane is flying horizontally at an altitude of $$2$$ km with a speed of $$300$$ $$ms-1$$. An armyman with an anti $$-$$ aircraft gun on the ground sights the enemy plane when it is directly overhead and fires a shell with a muzzle speed of $$600$$ $$ms-1$$. At what angle with the vertical should the gun be fired so as to hit the plane ?

Question

Infinity Learn · Accepted Answer

They should have same horizontal $$displacement.300t=Ucos$$⁡θ$$t300=600cos$$⁡θθ$$=60$$∘ with horizontal with vertical →$$30$$∘.

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