Repeat Prob. 2/57 for the case where aerodynamic drag is included. The magnitude of the drag deceleration is kv², where k = 3.5(10⁻³) ft⁻¹ and v is the speed in feet per second. The direction of the drag is opposite the motion of the projectile throughout the flight (when the projectile is moving upward, the drag is directed downward, and when the projectile is moving downward, the drag is directed upward).

Data from Prob. 2/57

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.

Transcribed Image Text:

255 ft/sec B 30° A 375'- Problem 2/57