A clerk moves a box of cans down an aisle by pulling horizontally on a strap attached to the box. The clerk pulls with a force of 185.0 N. The box has a mass of 35.0 kg and the coefficient of kinetic friction between the box and the floor is 0.45. find the acceleration of the box. in m/s^2

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.