There are a couple of problems with the same setup. On plugging in the values and solving for the integral, I am not getting the expected values of the force. Is there something wrong in the solution attached?
The section Kepler’s Second Law here describes the above equation.
In this problem,
##\text{r = D, m = M and v = V}##
What is the way to go about finding out ##\theta## as shown in Figure 13.21?