Interesed in practical maximum efficiency of linear alternators. Suppose an object with a permanent magnetic attached moves along a linear track with a constant velocity, such that its kinetic energy is 1 joule. The object "collides" with a linear alternator or generator, such that the magnet interacts with the coils in the alternator. How much of the initial kinetic energy of the object could be transformed to electrical energy? Am I right in assuming about .25 joules maximum?