 Unlike the momentum, kinetic energy is not a directed quantity. It is, like momentum, a function of the speed \(v\) of the object relative to an inertial frame. The faster an object moves relative to some inertial frame, the more momentum and kinetic energy it has. However, for an object that is not accelerating, i.e., an object that covers equal spaces in equal times, one can always find an inertial reference frame in which both the momentum and the kinetic energy of the object is zero. 