A group of engineers is tasked with designing a new windshield wiper that is easily replaceable and cheaper than previous models. Identify at least on criterion and one constraint for the new windshield wiper design.

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.