Answers edited by njolee

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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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• Will computer programming ever be a subject?
  
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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?