Which statement is true about a falling object? (Assume no air resistance)
1. The kinetic energy of the object is conserved.

2.The difference between the kinetic and potential energy of the
object remains the same.

3.The potential energy of the object is conserved.

4.The sum of the kinetic and potential energy of the object remains
the same.

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.