Aradar station detects an airplane approaching directly from the east. at first observation, the range to the plane is d1 = 354 m at 40° above the horizon. the airplane is tracked for another 123° in the vertical eastwest plane, the range at final contact being d2 = 800 m. see fig. 2-31. find the displacement of the airplane during the period of observation.

The particle p starts from rest at point a at time t = 0 and changes its speed thereafter at a constant rate of 2.8g as it follows the horizontal path shown. determine the magnitude and direction of its total acceleration (a) just before point b, (b) just after point b, and (c) as it passes point c. state your directions relative to the x-axis shown (ccw positive) and choose the angle with the smallest magnitude.