Please help i have less then 5 mins

The solid that is formed and usually sinks to the bottom of a solution is the

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.

Pls ! what are 3 examples of acceleration that doesn’t involve a change in speed ?