The fundamental problem of the calculus of variations on time scales concerns
the minimization of a delta-integral over all trajectories satisfying given
boundary conditions. This includes the discrete-time, the quantum, and the
continuous/classical calculus of variations as particular cases. In this note
we follow Leitmann's direct method to give explicit solutions for some concrete
optimal control problems on an arbitrary time scale.Comment: Accepted for publication (9/January/2010) in Applied Mathematics and
Computatio