<p>A fighter jet is flying horizontally at a certain altitude with a speed of 200&nbsp;<span class="equation">\(ms^{-1}\)</span>.&nbsp;When it passes directly overhead an anti-aircraft gun, a bullet is fired from the gun, at an angle&nbsp;<span class="equation">\(\theta\)</span>&nbsp;with the horizontal, to hit the jet. If the bullet speed is 400 m/s, the value of&nbsp;<span class="equation">\(\theta\)</span>&nbsp;will be ___________<span class="equation">\(^0\)</span>​​​​​​​</p>