  We present an analytical solution for the projectile coplanar motion under
constant drag parametrised by the velocity angle. We found the locus formed by
the apices of the projectile trajectories. The range and time of flight are
obtained numerically and we find that the optimal launching angle is smaller
than in the free drag case. This is a good example of problems with constant
dissipation of energy that includes curvature, and it is proper for
intermediate courses of mechanics.
