PLEASE HELP I AM GIVING OUT THOSE CROWN THINGS its science What example shows kinetic energy becomes potential energy?

A ball is dropped from a tall building.
A ball rolls up a ramp.
A ball is placed on a high shelf.
A ball rolls on the flat ground at a constant speed.

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.