what is the average acceleration of a car if a car rest from 0m/s and reaches a final velocity is 50m/s in 10m/s

The diagram shows four locations in the electric field of a positive point charge m. at which location is the electric potential the greatest.

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.

Four friends, a, b, c, and d are standing varying distances away from a speaker which is producing sound waves.