A 5.00 kg mass is at the origin. A 7.00 kg mass is located at x = 0.600m, and a 4.00 kg mass is at x= .900m what is the net gravitational force on 5 kg mass

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.