Find the angle between v = cos 120°¡+ sin 120°j and w = cos 135°¡+ sin 135°j. If necessary, round to the nearest tenth of a degree. The angle between v and w is

Find the angle of elevation of a rifle barrel, if a bullet fired at 1,500 feet per second takes 2 seconds to reach a height of 750 feet. Give your answer to the nearest tenth of a degree.