Which changes to observed time and length occur when objects approach the speed of light?
time moves slower and length increases.
time moves slower and length decreases.
time moves faster and length increases.
time moves faster and length decreases.

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.