To calculate the combined masses of stars in a binary system, we must measure their To calculate the combined masses of stars in a binary system, we must measure their spectral types and distance from Earth. orbital period and average orbital distance. luminosities and distance from Earth. absolute magnitudes and luminosities.

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.