A model train, with a mass of #9 kg#, is moving on a circular track with a radius of #15 m#. If the train's kinetic energy changes from #72 j# to #36 j#, by how much will the centripetal force applied by the tracks change by?
The change of centripetal force is
The centripetal force is
The kinetic energy is
The variation of kinetic energy is
The mass is
The radius is
The variation of centripetal force is