Using the hodograph method, we present an analytical solution for projectile coplanar motion under
constant drag, parametrised by the velocity angle. We find the locus formed by the apices of the
projectile trajectories, and discuss its implementation for the motion of a particle on an inclined
plane in presence of Coulomb friction. The range and time of flight are obtained numerically, and we
find that the optimal launching angle is smaller than in the drag-free case. This is a good example
of a problem with constant dissipation of energy that includes curvature; it is appropriate for
intermediate courses of mechanics.