Answers edited by njolee

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• A model train, with a mass of #4 kg#, is moving on a circular track with a radius of #8 m#. If the train's rate of revolution changes from #1/6 Hz# to #1/2 Hz#, by how much will the centripetal force applied by the tracks change by?
  
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• What is the difference between momentum(m×v) and kinetic energy (#1/2mv^2#)of an object?
  
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