IUT_14-15
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 An airplane is flying on a straight level course at 200 kmhour−1 at a height of 1000 m above the ground. An \text { An airplane is flying on a straight level course at } 200 \mathrm{~km} \mathrm{hour}^{-1} \text { at a height of } 1000 \mathrm{~m} \text { above the ground. An } anti-aircraft gun located on the ground fires a shell with an initial velocity of 300 ms−1, at the instant when \text { anti-aircraft gun located on the ground fires a shell with an initial velocity of } 300 \mathrm{~ms}^{-1} \text {, at the instant when } the plane is vertically above it. At what inclination, to the horizontal, should the gun be fired to hit the \text { the plane is vertically above it. At what inclination, to the horizontal, should the gun be fired to hit the } plane? \text { plane? }

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\text { An airplane is flying on a straight level course at } 200 ~km hour^{-1} \text { at a height of } 1000 ~m \text { above the ground. An } \text { anti-aircraft gun located on the ground fires a shell with an initial velocity of } 300 ~ms^{-1} \text {, at the instant when } \text { the plane is vertically above it. At what inclination, to the horizontal, should the gun be fired to hit the } \text { plane? }