The coefficient of kinetic friction between the 14-kg box and the inclined surface is mk = 0.1. The velocity of the box is zero when it is subjected to a constant horizontal force F = 20 N . What is the velocity of the box two seconds later?

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.