A projectile is fi red vertically from point A with an initial speed of 255 ft/sec. Relative to an observer located at B, at what times will the line of sight to the projectile make an angle of 30° with the horizontal? Compute the magnitude of the speed of the projectile at each time, and ignore the effect of aerodynamic drag on the projectile.

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255 ft/sec B 30° A 375'- Problem 2/57