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4 Aug 2022

If a projectile (such as a bullet) is fired into the air with an initial velocity v at an angle of elevation (see the figure below), then the height h of the projectile at time t is given by

h = + vt sin  

 

Find the angle of elevation of a rifle barrel, if a bullet fired at 1,600 feet per second takes 2 seconds to reach a height of 900. Give your answer to the nearest tenth of a degree. 

= _______