Starting from one oasis, Thaïs and Athanaël walk 25 km in a direction 30° south of west and then walk 30 km toward the north to a second oasis. What is the direction from the first oasis to the second oasis?

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.