The potential difference across the terminals of a battery is 8.40 V when there is a current of 1.50 A in the battery
from the negative to the positive terminal. When the
current is 3.50 A in the reverse direction, the potential
difference becomes 10.20V. (a) What is the internal
resistance of the battery? (b) What is the emf of the
battery?

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.